<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: PgCache_Environment.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
namespace W3TC;

/**
 * class PgCache_Environment
 */
class PgCache_Environment {
	/**
	 * Fixes environment in each wp-admin request
	 *
	 * @param Config  $config
	 * @param bool    $force_all_checks
	 *
	 * @throws Util_Environment_Exceptions
	 */
	public function fix_on_wpadmin_request( $config, $force_all_checks ) {
		$exs = new Util_Environment_Exceptions();

		if ( ( !defined( 'WP_CACHE' ) || !WP_CACHE ) ) {
			try {
				$this-&gt;wp_config_add_directive();
			} catch ( Util_WpFile_FilesystemOperationException $ex ) {
				$exs-&gt;push( $ex );
			}
		}

		$this-&gt;fix_folders( $config, $exs );

		if ( $config-&gt;get_boolean( 'config.check' ) || $force_all_checks ) {
			if ( $this-&gt;is_rules_required( $config ) ) {
				$this-&gt;rules_core_add( $config, $exs );
				$this-&gt;rules_cache_add( $config, $exs );
			} else {
				$this-&gt;rules_core_remove( $exs );
				$this-&gt;rules_cache_remove( $exs );
			}
		}

		// if no errors so far - check if rewrite actually works
		if ( count( $exs-&gt;exceptions() ) &lt;= 0 ) {
			try {
				if ( $config-&gt;get_boolean( 'pgcache.enabled' ) &amp;&amp;
					$config-&gt;get_string( 'pgcache.engine' ) == 'file_generic' ) {
					$this-&gt;verify_file_generic_compatibility();

					if ( $config-&gt;get_boolean( 'pgcache.debug' ) )
						$this-&gt;verify_file_generic_rewrite_working();
				}
			} catch ( \Exception $ex ) {
				$exs-&gt;push( $ex );
			}
		}

		if ( count( $exs-&gt;exceptions() ) &gt; 0 )
			throw $exs;
	}

	/**
	 * Fixes environment once event occurs
	 *
	 * @param Config  $config
	 * @param string  $event
	 * @param null|Config $old_config
	 * @throws Util_Environment_Exceptions
	 */
	public function fix_on_event( $config, $event, $old_config = null ) {
		// Schedules events
		if ( $config-&gt;get_boolean( 'pgcache.enabled' ) &amp;&amp;
			( $config-&gt;get_string( 'pgcache.engine' ) == 'file' ||
				$config-&gt;get_string( 'pgcache.engine' ) == 'file_generic' ) ) {
			if ( $old_config != null &amp;&amp;
				$config-&gt;get_integer( 'pgcache.file.gc' ) !=
				$old_config-&gt;get_integer( 'pgcache.file.gc' ) ) {
				$this-&gt;unschedule_gc();
			}

			if ( !wp_next_scheduled( 'w3_pgcache_cleanup' ) ) {
				wp_schedule_event( time(),
					'w3_pgcache_cleanup', 'w3_pgcache_cleanup' );
			}
		} else {
			$this-&gt;unschedule_gc();
		}

		// Schedule prime event
		if ( $config-&gt;get_boolean( 'pgcache.enabled' ) &amp;&amp;
			$config-&gt;get_boolean( 'pgcache.prime.enabled' ) ) {
			if ( $old_config != null &amp;&amp;
				$config-&gt;get_integer( 'pgcache.prime.interval' ) !=
				$old_config-&gt;get_integer( 'pgcache.prime.interval' ) ) {
				$this-&gt;unschedule_prime();
			}

			if ( !wp_next_scheduled( 'w3_pgcache_prime' ) ) {
				wp_schedule_event( time(),
					'w3_pgcache_prime', 'w3_pgcache_prime' );
			}
		} else {
			$this-&gt;unschedule_prime();
		}
	}

	/**
	 * Fixes environment after plugin deactivation
	 *
	 * @throws Util_Environment_Exceptions
	 */
	public function fix_after_deactivation() {
		$exs = new Util_Environment_Exceptions();

		try {
			$this-&gt;wp_config_remove_directive( $exs );
		} catch ( Util_WpFile_FilesystemOperationException $ex ) {
			$exs-&gt;push( $ex );
		}

		$this-&gt;rules_core_remove( $exs );
		$this-&gt;rules_cache_remove( $exs );

		$this-&gt;unschedule_gc();
		$this-&gt;unschedule_prime();

		if ( count( $exs-&gt;exceptions() ) &gt; 0 )
			throw $exs;
	}

	/**
	 * Are rewrite rules required?.
	 *
	 * @since 0.9.7.3
	 *
	 * @param  Config $c Configuration.
	 * @return bool
	 */
	private function is_rules_required( $c ) {
		$e = $c-&gt;get_string( 'pgcache.engine' );

		return $c-&gt;get_boolean( 'pgcache.enabled' ) &amp;&amp;
			( 'file_generic' === $e || 'nginx_memcached' === $e );
	}

	/**
	 * Returns required rules for module
	 *
	 * @param Config  $config
	 * @return array
	 */
	public function get_required_rules( $config ) {
		if ( !$this-&gt;is_rules_required( $config ) ) {
			return null;
		}

		$rewrite_rules = array();
		$pgcache_rules_core_path = Util_Rule::get_pgcache_rules_core_path();
		$rewrite_rules[] = array(
			'filename' =&gt; $pgcache_rules_core_path,
			'content' =&gt; $this-&gt;rules_core_generate( $config ),
			'priority' =&gt; 1000
		);

		$pgcache_rules_cache_path = Util_Rule::get_pgcache_rules_cache_path();
		$rewrite_rules[] = array(
			'filename' =&gt; $pgcache_rules_cache_path,
			'content' =&gt; $this-&gt;rules_cache_generate( $config )
		);

		return $rewrite_rules;
	}


	/**
	 * Fixes folders
	 *
	 * @param Config  $config
	 * @param Util_Environment_Exceptions $exs
	 */
	private function fix_folders( $config, $exs ) {
		if ( !$config-&gt;get_boolean( 'pgcache.enabled' ) )
			return;

		// folder that we delete if exists and not writeable
		if ( $config-&gt;get_string( 'pgcache.engine' ) == 'file_generic' )
			$dir = W3TC_CACHE_PAGE_ENHANCED_DIR;
		else if ( $config-&gt;get_string( 'pgcache.engine' ) != 'file' )
				$dir = W3TC_CACHE_DIR . '/page';
			else
				return;

			try{
			if ( file_exists( $dir ) &amp;&amp; !is_writeable( $dir ) )
				Util_WpFile::delete_folder( $dir, '', isset( $_SERVER['REQUEST_URI'] ) ? esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '' );
		} catch ( Util_WpFile_FilesystemRmdirException $ex ) {
			$exs-&gt;push( $ex );
		}
	}

	/**
	 * Checks if mode can be used
	 */
	private function verify_file_generic_compatibility() {
		$permalink_structure = get_option( 'permalink_structure' );

		if ( $permalink_structure == '' ) {
			throw new Util_Environment_Exception( 'Disk Enhanced mode ' .
				'can\'t work with &quot;Default&quot; permalinks structure' );
		}
	}

	/**
	 * Fixes environment for enabled pgcache
	 *
	 * @throws Util_Environment_Exceptions
	 */
	private function verify_file_generic_rewrite_working() {
		$url = get_home_url() . '/w3tc_rewrite_test' . rand();
		if ( !$this-&gt;test_rewrite( $url ) ) {
			$key = sprintf( 'w3tc_rewrite_test_result_%s', substr( md5( $url ), 0, 16 ) );
			$result = get_transient( $key );

			$home_url = get_home_url();

			$tech_message =
				( Util_Environment::is_nginx() ? 'nginx configuration file' : '.htaccess file' ) .
				' contains rules to rewrite url ' .
				$home_url . '/w3tc_rewrite_test into ' .
				$home_url . '/?w3tc_rewrite_test which, if handled by ' .
				'plugin, return &quot;OK&quot; message.&lt;br/&gt;';
			$tech_message .= 'The plugin made a request to ' .
				$home_url . '/w3tc_rewrite_test but received: &lt;br /&gt;' .
				$result . '&lt;br /&gt;';
			$tech_message .= 'instead of &quot;OK&quot; response. &lt;br /&gt;';

			$error = '&lt;strong&gt;W3 Total Cache error:&lt;/strong&gt; ' .
				'It appears Page Cache ' .
				'&lt;acronym title=&quot;Uniform Resource Locator&quot;&gt;URL&lt;/acronym&gt; ' .
				'rewriting is not working. ';
			if ( Util_Environment::is_preview_mode() ) {
				$error .= ' This could be due to using Preview mode. &lt;a href=&quot;' . $url . '&quot;&gt;Click here&lt;/a&gt; to manually verify its working. It should say OK. &lt;br /&gt;';
			}

			if ( Util_Environment::is_nginx() ) {
				$error .= 'Please verify that all configuration files are ' .
					'included in the configuration file ' .
					'(and that you have reloaded / restarted nginx).';
			} else {
				$error .= 'Please verify that the server configuration ' .
					'allows .htaccess';
			}

			$error .= '&lt;br /&gt;Unfortunately disk enhanced page caching will ' .
				'not function without custom rewrite rules. ' .
				'Please ask your server administrator for assistance. ' .
				'Also refer to &lt;a href=&quot;' .
				admin_url( 'admin.php?page=w3tc_install' ) .
				'&quot;&gt;the install page&lt;/a&gt;  for the rules for your server.';

			throw new Util_Environment_Exception( $error, $tech_message );
		}
	}

	/**
	 * Perform rewrite test
	 *
	 * @param string  $url
	 * @return boolean
	 */
	private function test_rewrite( $url ) {
		$key = sprintf( 'w3tc_rewrite_test_%s', substr( md5( $url ), 0, 16 ) );
		$result = get_transient( $key );

		if ( $result === false ) {

			$response = Util_Http::get( $url );

			$result = ( !is_wp_error( $response ) &amp;&amp; $response['response']['code'] == 200 &amp;&amp; trim( $response['body'] ) == 'OK' );

			if ( $result ) {
				set_transient( $key, $result, 30 );
			} else {
				$key_result = sprintf( 'w3tc_rewrite_test_result_%s', substr( md5( $url ), 0, 16 ) );
				set_transient( $key_result, is_wp_error( $response )? $response-&gt;get_error_message(): implode( ' ', $response['response'] ), 30 );
			}
		}

		return $result;
	}


	/**
	 * scheduling stuff
	 */
	private function unschedule_gc() {
		if ( wp_next_scheduled( 'w3_pgcache_cleanup' ) )
			wp_clear_scheduled_hook( 'w3_pgcache_cleanup' );
	}

	private function unschedule_prime() {
		if ( wp_next_scheduled( 'w3_pgcache_prime' ) )
			wp_clear_scheduled_hook( 'w3_pgcache_prime' );
	}


	/*
	 * wp-config modification
	 */

	/**
	 * Enables WP_CACHE
	 *
	 * @throws Util_WpFile_FilesystemOperationException with S/FTP form if it can't get the required filesystem credentials
	 */
	private function wp_config_add_directive() {
		$config_path = Util_Environment::wp_config_path();

		$config_data = @file_get_contents( $config_path );
		if ( $config_data === false )
			return;

		$new_config_data = $this-&gt;wp_config_remove_from_content( $config_data );
		$new_config_data = preg_replace(
			'~&lt;\?(php)?~',
			&quot;\\0\r\n&quot; . $this-&gt;wp_config_addon(),
			$new_config_data,
			1 );

		if ( $new_config_data != $config_data ) {
			try {
				Util_WpFile::write_to_file( $config_path, $new_config_data );
			} catch ( Util_WpFile_FilesystemOperationException $ex ) {
				throw new Util_WpFile_FilesystemModifyException(
					$ex-&gt;getMessage(), $ex-&gt;credentials_form(),
					'Edit file &lt;strong&gt;' . $config_path .
					'&lt;/strong&gt; and add next lines:', $config_path,
					$this-&gt;wp_config_addon() );
			}
		}
		// that file was in opcache for sure and it may take time to
		// start execution of new modified now version
		$o = Dispatcher::component( 'SystemOpCache_Core' );
		$o-&gt;flush();
	}

	/**
	 * Disables WP_CACHE
	 *
	 * @throws Util_WpFile_FilesystemOperationException with S/FTP form if it can't get the required filesystem credentials
	 */
	private function wp_config_remove_directive() {
		$config_path = Util_Environment::wp_config_path();

		$config_data = @file_get_contents( $config_path );
		if ( $config_data === false )
			return;

		$new_config_data = $this-&gt;wp_config_remove_from_content( $config_data );
		if ( $new_config_data != $config_data ) {
			try {
				Util_WpFile::write_to_file( $config_path, $new_config_data );
			} catch ( Util_WpFile_FilesystemOperationException $ex ) {
				throw new Util_WpFile_FilesystemModifyException(
					$ex-&gt;getMessage(), $ex-&gt;credentials_form(),
					'Edit file &lt;strong&gt;' . $config_path .
					'&lt;/strong&gt; and remove next lines:',
					$config_path,  $this-&gt;wp_config_addon() );
			}
		}
	}

	/**
	 * Returns string Addon required for plugin in wp-config
	 */
	private function wp_config_addon() {
		return &quot;/** Enable W3 Total Cache */\r\n&quot; .
			&quot;define('WP_CACHE', true); // Added by W3 Total Cache\r\n&quot;;
	}

	/**
	 * Disables WP_CACHE
	 *
	 * @param string  $config_data wp-config.php content
	 * @return string
	 * @throws Util_WpFile_FilesystemOperationException with S/FTP form if it can't get the required filesystem credentials
	 */
	private function wp_config_remove_from_content( $config_data ) {
		$config_data = preg_replace(
			&quot;~\\/\\*\\* Enable W3 Total Cache \\*\\*?\\/.*?\\/\\/ Added by W3 Total Cache(\r\n)*~s&quot;,
			'', $config_data );
		$config_data = preg_replace(
			&quot;~(\\/\\/\\s*)?define\\s*\\(\\s*['\&quot;]?WP_CACHE['\&quot;]?\\s*,.*?\\)\\s*;+\\r?\\n?~is&quot;,
			'', $config_data );

		return $config_data;
	}


	/**
	 * rules core modification
	 */

	/**
	 * Writes directives to WP .htaccess / nginx.conf
	 * returns true if modifications has been made
	 */
	private function rules_core_add( $config, $exs ) {
		Util_Rule::add_rules( $exs, Util_Rule::get_pgcache_rules_core_path(),
			$this-&gt;rules_core_generate( $config ),
			W3TC_MARKER_BEGIN_PGCACHE_CORE,
			W3TC_MARKER_END_PGCACHE_CORE,
			array(
				W3TC_MARKER_BEGIN_WORDPRESS =&gt; 0,
				W3TC_MARKER_END_MINIFY_CORE =&gt;
					strlen( W3TC_MARKER_END_MINIFY_CORE ) + 1,
				W3TC_MARKER_END_BROWSERCACHE_CACHE =&gt;
					strlen( W3TC_MARKER_END_BROWSERCACHE_CACHE ) + 1,
				W3TC_MARKER_END_PGCACHE_CACHE =&gt;
					strlen( W3TC_MARKER_END_PGCACHE_CACHE ) + 1,
				W3TC_MARKER_END_MINIFY_CACHE =&gt;
					strlen( W3TC_MARKER_END_MINIFY_CACHE ) + 1
			),
			true
		);
	}

	/**
	 * Removes Page Cache core directives
	 *
	 * @param Util_Environment_Exceptions $exs
	 * @throws Util_WpFile_FilesystemOperationException with S/FTP form if it can't get the required filesystem credentials
	 */
	private function rules_core_remove( $exs ) {
		Util_Rule::remove_rules( $exs, Util_Rule::get_pgcache_rules_core_path(),
			W3TC_MARKER_BEGIN_PGCACHE_CORE,
			W3TC_MARKER_END_PGCACHE_CORE
		);
	}

	/**
	 * Generates rules for WP dir
	 *
	 * @param Config  $config
	 * @return string
	 */
	private function rules_core_generate( $config ) {
		switch ( true ) {
		case Util_Environment::is_apache():
		case Util_Environment::is_litespeed():
			return $this-&gt;rules_core_generate_apache( $config );

		case Util_Environment::is_nginx():
			return $this-&gt;rules_core_generate_nginx( $config );
		}

		return '';
	}

	/**
	 * Generates rules for WP dir
	 *
	 * @param Config  $config
	 * @return string
	 */
	private function rules_core_generate_apache( $config ) {
		$rewrite_base = Util_Environment::network_home_url_uri();
		$cache_dir = Util_Environment::normalize_path( W3TC_CACHE_PAGE_ENHANCED_DIR );
		$permalink_structure = get_option( 'permalink_structure' );

		$current_user = wp_get_current_user();

		/**
		 * Auto reject cookies
		 */
		$reject_cookies = array(
			'comment_author',
			'wp-postpass'
		);

		$reject_cookies[] = 'w3tc_logged_out';

		/**
		 * Reject cache for logged in users
		 * OR
		 * Reject cache for roles if any
		 */
		if ( $config-&gt;get_boolean( 'pgcache.reject.logged' ) ) {
			$reject_cookies = array_merge( $reject_cookies, array(
					'wordpress_logged_in'
				) );
		} elseif ( $config-&gt;get_boolean( 'pgcache.reject.logged_roles' ) ) {
			$new_cookies = array();
			foreach ( $config-&gt;get_array( 'pgcache.reject.roles' ) as $role ) {
				$new_cookies[] = 'w3tc_logged_' . md5( NONCE_KEY . $role );
			}
			$reject_cookies = array_merge( $reject_cookies, $new_cookies );
		}

		/**
		 * Custom config
		 */
		$reject_cookies = array_merge( $reject_cookies, $config-&gt;get_array( 'pgcache.reject.cookie' ) );
		Util_Rule::array_trim( $reject_cookies );

		$reject_user_agents = $config-&gt;get_array( 'pgcache.reject.ua' );
		if ( $config-&gt;get_boolean( 'pgcache.compatibility' ) ) {
			$reject_user_agents = array_merge( array( W3TC_POWERED_BY ), $reject_user_agents );
		}

		Util_Rule::array_trim( $reject_user_agents );

		/**
		 * Generate directives
		 */
		$env_W3TC_UA = '';
		$env_W3TC_REF = '';
		$env_W3TC_COOKIE = '';
		$env_W3TC_SSL = '';
		$env_W3TC_ENC = '';

		$rules = '';
		$rules .= W3TC_MARKER_BEGIN_PGCACHE_CORE . &quot;\n&quot;;
		$rules .= &quot;&lt;IfModule mod_rewrite.c&gt;\n&quot;;
		$rules .= &quot;    RewriteEngine On\n&quot;;
		$rules .= &quot;    RewriteBase &quot; . $rewrite_base . &quot;\n&quot;;


		if ( $config-&gt;get_boolean( 'pgcache.debug' ) ) {
			$rules .= &quot;    RewriteRule ^(.*\\/)?w3tc_rewrite_test([0-9]+)/?$ $1?w3tc_rewrite_test=1 [L]\n&quot;;
		}


		/**
		 * Set accept query strings
		 */
		$w3tc_query_strings = apply_filters(
			'w3tc_pagecache_rules_apache_accept_qs',
			$config-&gt;get_array( 'pgcache.accept.qs' ) );
		Util_Rule::array_trim( $w3tc_query_strings );

		if ( !empty( $w3tc_query_strings ) ) {
			$w3tc_query_strings = str_replace( ' ', '+', $w3tc_query_strings );
			$w3tc_query_strings = array_map( array( '\W3TC\Util_Environment', 'preg_quote' ), $w3tc_query_strings );

			$rules .= &quot;    RewriteRule ^ - [E=W3TC_QUERY_STRING:%{QUERY_STRING}]\n&quot;;

			foreach ( $w3tc_query_strings as $query ) {
				$query_rules = array();
				if  ( strpos( $query, '=' ) === false ) {
					$query_rules[] = 'RewriteCond %{ENV:W3TC_QUERY_STRING} ^(.*?&amp;|)' .
						$query . '(=[^&amp;]*)?(&amp;.*|)$ [NC]';
					$query_rules[] = 'RewriteRule ^ - [E=W3TC_QUERY_STRING:%1%3]';
				} else {
					$query_rules[] = 'RewriteCond %{ENV:W3TC_QUERY_STRING} ^(.*?&amp;|)' .
						$query . '(&amp;.*|)$ [NC]';
					$query_rules[] = 'RewriteRule ^ - [E=W3TC_QUERY_STRING:%1%2]';
				}

				$query_rules = apply_filters(
					'w3tc_pagecache_rules_apache_accept_qs_rules',
					$query_rules, $query );
				$rules .= '    ' . implode( &quot;\n    &quot;, $query_rules ) . &quot;\n&quot;;
			}

			$rules .= &quot;    RewriteCond %{ENV:W3TC_QUERY_STRING} ^&amp;+$\n&quot;;
			$rules .= &quot;    RewriteRule ^ - [E=W3TC_QUERY_STRING]\n&quot;;
		}

		/**
		 * Check for mobile redirect
		 */
		if ( $config-&gt;get_boolean( 'mobile.enabled' ) ) {
			$mobile_groups = $config-&gt;get_array( 'mobile.rgroups' );

			foreach ( $mobile_groups as $mobile_group =&gt; $mobile_config ) {
				$mobile_enabled = ( isset( $mobile_config['enabled'] ) ? (boolean) $mobile_config['enabled'] : false );
				$mobile_agents = ( isset( $mobile_config['agents'] ) ? (array) $mobile_config['agents'] : '' );
				$mobile_redirect = ( isset( $mobile_config['redirect'] ) ? $mobile_config['redirect'] : '' );

				if ( $mobile_enabled &amp;&amp; count( $mobile_agents ) &amp;&amp; $mobile_redirect ) {
					$rules .= &quot;    RewriteCond %{HTTP_USER_AGENT} (&quot; . implode( '|', $mobile_agents ) . &quot;) [NC]\n&quot;;
					$rules .= &quot;    RewriteRule .* &quot; . $mobile_redirect . &quot; [R,L]\n&quot;;
				}
			}
		}

		/**
		 * Check for referrer redirect
		 */
		if ( $config-&gt;get_boolean( 'referrer.enabled' ) ) {
			$referrer_groups = $config-&gt;get_array( 'referrer.rgroups' );

			foreach ( $referrer_groups as $referrer_group =&gt; $referrer_config ) {
				$referrer_enabled = ( isset( $referrer_config['enabled'] ) ? (boolean) $referrer_config['enabled'] : false );
				$referrer_referrers = ( isset( $referrer_config['referrers'] ) ? (array) $referrer_config['referrers'] : '' );
				$referrer_redirect = ( isset( $referrer_config['redirect'] ) ? $referrer_config['redirect'] : '' );

				if ( $referrer_enabled &amp;&amp; count( $referrer_referrers ) &amp;&amp; $referrer_redirect ) {
					$rules .= &quot;    RewriteCond %{HTTP_COOKIE} w3tc_referrer=.*(&quot; . implode( '|', $referrer_referrers ) . &quot;) [NC]\n&quot;;
					$rules .= &quot;    RewriteRule .* &quot; . $referrer_redirect . &quot; [R,L]\n&quot;;
				}
			}
		}

		/**
		 * Set mobile groups
		 */
		if ( $config-&gt;get_boolean( 'mobile.enabled' ) ) {
			$mobile_groups = array_reverse( $config-&gt;get_array( 'mobile.rgroups' ) );

			foreach ( $mobile_groups as $mobile_group =&gt; $mobile_config ) {
				$mobile_enabled = ( isset( $mobile_config['enabled'] ) ? (boolean) $mobile_config['enabled'] : false );
				$mobile_agents = ( isset( $mobile_config['agents'] ) ? (array) $mobile_config['agents'] : '' );
				$mobile_redirect = ( isset( $mobile_config['redirect'] ) ? $mobile_config['redirect'] : '' );

				if ( $mobile_enabled &amp;&amp; count( $mobile_agents ) &amp;&amp; !$mobile_redirect ) {
					$rules .= &quot;    RewriteCond %{HTTP_USER_AGENT} (&quot; . implode( '|', $mobile_agents ) . &quot;) [NC]\n&quot;;
					$rules .= &quot;    RewriteRule .* - [E=W3TC_UA:_&quot; . $mobile_group . &quot;]\n&quot;;
					$env_W3TC_UA = '%{ENV:W3TC_UA}';
				}
			}
		}

		/**
		 * Set referrer groups
		 */
		if ( $config-&gt;get_boolean( 'referrer.enabled' ) ) {
			$referrer_groups = array_reverse( $config-&gt;get_array( 'referrer.rgroups' ) );

			foreach ( $referrer_groups as $referrer_group =&gt; $referrer_config ) {
				$referrer_enabled = ( isset( $referrer_config['enabled'] ) ? (boolean) $referrer_config['enabled'] : false );
				$referrer_referrers = ( isset( $referrer_config['referrers'] ) ? (array) $referrer_config['referrers'] : '' );
				$referrer_redirect = ( isset( $referrer_config['redirect'] ) ? $referrer_config['redirect'] : '' );

				if ( $referrer_enabled &amp;&amp; count( $referrer_referrers ) &amp;&amp; !$referrer_redirect ) {
					$rules .= &quot;    RewriteCond %{HTTP_COOKIE} w3tc_referrer=.*(&quot; . implode( '|', $referrer_referrers ) . &quot;) [NC]\n&quot;;
					$rules .= &quot;    RewriteRule .* - [E=W3TC_REF:_&quot; . $referrer_group . &quot;]\n&quot;;
					$env_W3TC_REF = '%{ENV:W3TC_REF}';
				}
			}
		}

		/**
		 * Set cookie group
		 */
		if ( $config-&gt;get_boolean( 'pgcache.cookiegroups.enabled' ) ) {
			$cookie_groups = $config-&gt;get_array( 'pgcache.cookiegroups.groups' );

			foreach ( $cookie_groups as $group_name =&gt; $g ) {
				if ( isset( $g['enabled'] ) &amp;&amp; $g['enabled'] ) {
					$cookies = array();
					foreach ($g['cookies'] as $cookie ) {
						$cookie = trim( $cookie );
						if ( !empty( $cookie ) ) {
							$cookie = str_replace( '+', ' ', $cookie );
							$cookie = Util_Environment::preg_quote( $cookie );
							if ( strpos( $cookie, '=') === false )
								$cookie .= '=.*';
							$cookies[] = $cookie;
						}
					}

					if ( count( $cookies ) &gt; 0 ) {
						$cookies_regexp = '^(.*;\s*)?(' . implode( '|', $cookies ) . ')(\s*;.*)?$';
						$rules .= &quot;    RewriteCond %{HTTP_COOKIE} $cookies_regexp [NC]\n&quot;;
						$rules .= &quot;    RewriteRule .* - [E=W3TC_COOKIE:_&quot; . $group_name . &quot;]\n&quot;;
						$env_W3TC_COOKIE = '%{ENV:W3TC_COOKIE}';
					}
				}
			}
		}

		/**
		 * Set HTTPS
		 */
		if ( $config-&gt;get_boolean( 'pgcache.cache.ssl' ) ) {
			$rules .= &quot;    RewriteCond %{HTTPS} =on\n&quot;;
			$rules .= &quot;    RewriteRule .* - [E=W3TC_SSL:_ssl]\n&quot;;
			$rules .= &quot;    RewriteCond %{SERVER_PORT} =443\n&quot;;
			$rules .= &quot;    RewriteRule .* - [E=W3TC_SSL:_ssl]\n&quot;;
			$rules .= &quot;    RewriteCond %{HTTP:X-Forwarded-Proto} =https [NC]\n&quot;;
			$rules .= &quot;    RewriteRule .* - [E=W3TC_SSL:_ssl]\n&quot;;
			$env_W3TC_SSL = '%{ENV:W3TC_SSL}';
		}

		$cache_path = str_replace( Util_Environment::document_root(), '', $cache_dir );

		/**
		 * Set Accept-Encoding
		 */
		if ( $config-&gt;get_boolean( 'browsercache.enabled' ) &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.brotli' ) ) {
			$rules .= &quot;    RewriteCond %{HTTP:Accept-Encoding} br\n&quot;;
			$rules .= &quot;    RewriteRule .* - [E=W3TC_ENC:_br]\n&quot;;
			$env_W3TC_ENC = '%{ENV:W3TC_ENC}';
		} else if ( $config-&gt;get_boolean( 'browsercache.enabled' ) &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.compression' ) ) {
			$rules .= &quot;    RewriteCond %{HTTP:Accept-Encoding} gzip\n&quot;;
			$rules .= &quot;    RewriteRule .* - [E=W3TC_ENC:_gzip]\n&quot;;
			$env_W3TC_ENC = '%{ENV:W3TC_ENC}';
		}
		$rules .= &quot;    RewriteCond %{HTTP_COOKIE} w3tc_preview [NC]\n&quot;;
		$rules .= &quot;    RewriteRule .* - [E=W3TC_PREVIEW:_preview]\n&quot;;
		$env_W3TC_PREVIEW = '%{ENV:W3TC_PREVIEW}';

		$rules .= &quot;    RewriteCond %{REQUEST_URI} \\/$\n&quot;;
		$rules .= &quot;    RewriteRule .* - [E=W3TC_SLASH:_slash]\n&quot;;
		$env_W3TC_SLASH = '%{ENV:W3TC_SLASH}';

		$use_cache_rules = '';
		/**
		 * Don't accept POSTs
		 */
		$use_cache_rules .= &quot;    RewriteCond %{REQUEST_METHOD} !=POST\n&quot;;

		/**
		 * Query string should be empty
		 */
		$use_cache_rules .= empty( $w3tc_query_strings ) ?
			&quot;    RewriteCond %{QUERY_STRING} =\&quot;\&quot;\n&quot; :
			&quot;    RewriteCond %{ENV:W3TC_QUERY_STRING} =\&quot;\&quot;\n&quot;;

		/**
		 * Check for rejected cookies
		 */
		$use_cache_rules .= &quot;    RewriteCond %{HTTP_COOKIE} !(&quot; . implode( '|',
			array_map( array( '\W3TC\Util_Environment', 'preg_quote' ), $reject_cookies ) ) . &quot;) [NC]\n&quot;;

		/**
		 * Check for rejected user agents
		 */
		if ( count( $reject_user_agents ) ) {
			$use_cache_rules .= &quot;    RewriteCond %{HTTP_USER_AGENT} !(&quot; .
				implode( '|',
				array_map( array( '\W3TC\Util_Environment', 'preg_quote' ), $reject_user_agents ) ) . &quot;) [NC]\n&quot;;
		}

		/**
		 * Make final rewrites for specific files
		 */
		$uri_prefix =  $cache_path . '/%{HTTP_HOST}/%{REQUEST_URI}/' .
			'_index' . $env_W3TC_SLASH . $env_W3TC_UA . $env_W3TC_REF . $env_W3TC_COOKIE .
			$env_W3TC_SSL . $env_W3TC_PREVIEW;
		$uri_prefix = apply_filters( 'w3tc_pagecache_rules_apache_uri_prefix',
			$uri_prefix );

		$switch = &quot; -&quot; . ( $config-&gt;get_boolean( 'pgcache.file.nfs' ) ? 'F' : 'f' );

		$document_root = Util_Rule::apache_docroot_variable();

		// write rule to rewrite to .html/.xml file
		$exts = array( '.html' );
		if ($config-&gt;get_boolean('pgcache.cache.nginx_handle_xml'))
			$exts[] = '.xml';

		foreach ( $exts as $ext ) {
			$rules .= $use_cache_rules;

			$rules .= &quot;    RewriteCond \&quot;&quot; . $document_root . $uri_prefix . $ext .
				$env_W3TC_ENC . &quot;\&quot;&quot; . $switch . &quot;\n&quot;;
			$rules .= &quot;    RewriteRule .* \&quot;&quot; . $uri_prefix . $ext .
				$env_W3TC_ENC . &quot;\&quot; [L]\n&quot;;
		}

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

		$rules .= W3TC_MARKER_END_PGCACHE_CORE . &quot;\n&quot;;

		return $rules;
	}

	/**
	 * Generates rules for WP dir
	 *
	 * @param Config  $config
	 * @return string
	 */
	private function rules_core_generate_nginx( $config ) {
		$is_network = Util_Environment::is_wpmu();

		$cache_dir = Util_Environment::normalize_path( W3TC_CACHE_PAGE_ENHANCED_DIR );
		$permalink_structure = get_option( 'permalink_structure' );
		$pgcache_engine = $config-&gt;get_string( 'pgcache.engine' );

		/**
		 * Auto reject cookies
		 */
		$reject_cookies = array(
			'comment_author',
			'wp-postpass'
		);

		if ( $pgcache_engine == 'file_generic' ) {
			$reject_cookies[] = 'w3tc_logged_out';
		}

		/**
		 * Reject cache for logged in users
		 * OR
		 * Reject cache for roles if any
		 */
		if ( $config-&gt;get_boolean( 'pgcache.reject.logged' ) ) {
			$reject_cookies = array_merge( $reject_cookies, array(
					'wordpress_logged_in'
				) );
		} elseif ( $config-&gt;get_boolean( 'pgcache.reject.logged_roles' ) ) {
			$new_cookies = array();
			foreach ( $config-&gt;get_array( 'pgcache.reject.roles' ) as $role ) {
				$new_cookies[] = 'w3tc_logged_' . md5( NONCE_KEY . $role );
			}
			$reject_cookies = array_merge( $reject_cookies, $new_cookies );
		}

		/**
		 * Custom config
		 */
		$reject_cookies = array_merge( $reject_cookies,
			$config-&gt;get_array( 'pgcache.reject.cookie' ) );
		Util_Rule::array_trim( $reject_cookies );

		$reject_user_agents = $config-&gt;get_array( 'pgcache.reject.ua' );
		if ( $config-&gt;get_boolean( 'pgcache.compatibility' ) ) {
			$reject_user_agents = array_merge( array( W3TC_POWERED_BY ),
				$reject_user_agents );
		}
		Util_Rule::array_trim( $reject_user_agents );

		/**
		 * Generate rules
		 */
		$env_w3tc_ua = '';
		$env_w3tc_ref = '';
		$env_w3tc_cookie = '';
		$env_w3tc_ssl = '';
		$env_w3tc_ext = '';
		$env_w3tc_enc = '';
		$env_request_uri = '$request_uri';

		$rules = '';
		$rules .= W3TC_MARKER_BEGIN_PGCACHE_CORE . &quot;\n&quot;;
		if ( $config-&gt;get_boolean( 'pgcache.debug' ) ) {
			$rules .= &quot;rewrite ^(.*\\/)?w3tc_rewrite_test([0-9]+)/?$ $1?w3tc_rewrite_test=1 last;\n&quot;;
		}

		/**
		 * Set accept query strings
		 */
		$w3tc_query_strings = apply_filters(
			'w3tc_pagecache_rules_nginx_accept_qs',
			$config-&gt;get_array( 'pgcache.accept.qs' ) );

		Util_Rule::array_trim( $w3tc_query_strings );

		if ( !empty( $w3tc_query_strings ) ) {
		   $w3tc_query_strings = str_replace( ' ', '+', $w3tc_query_strings );
		   $w3tc_query_strings = array_map( array( '\W3TC\Util_Environment', 'preg_quote' ), $w3tc_query_strings );

			$rules .= &quot;set \$w3tc_query_string \$query_string;\n&quot;;

			foreach ( $w3tc_query_strings as $query ) {
				$query_rules = array();
				if ( strpos( $query, '=' ) === false ) {
					$query_rules[] = 'if ($w3tc_query_string ~* &quot;^(.*?&amp;|)' . $query . '(=[^&amp;]*)?(&amp;.*|)$&quot;) {';
					$query_rules[] = '    set $w3tc_query_string $1$3;';
					$query_rules[] = '}';
				} else {
					$query_rules[] = 'if ($w3tc_query_string ~* &quot;^(.*?&amp;|)' . $query . '(&amp;.*|)$&quot;) {';
					$query_rules[] = '    set $w3tc_query_string $1$2;';
					$query_rules[] = '}';
				}

				$query_rules = apply_filters(
					'w3tc_pagecache_rules_nginx_accept_qs_rules',
					$query_rules, $query );
				$rules .= implode( &quot;\n&quot;, $query_rules ) . &quot;\n&quot;;
			}

			$rules .= &quot;if (\$w3tc_query_string ~ ^[?&amp;]+$) {\n&quot;;
			$rules .= &quot;    set \$w3tc_query_string \&quot;\&quot;;\n&quot;;
			$rules .= &quot;}\n&quot;;

			$rules .= &quot;set \$w3tc_request_uri \$request_uri;\n&quot;;
			$rules .= &quot;if (\$w3tc_request_uri ~* \&quot;^([^?]+)\?\&quot;) {\n&quot;;
			$rules .= &quot;    set \$w3tc_request_uri \$1;\n&quot;;
			$rules .= &quot;}\n&quot;;
			$env_request_uri = '$w3tc_request_uri';
		}

		/**
		 * Check for mobile redirect
		 */
		if ( $config-&gt;get_boolean( 'mobile.enabled' ) ) {
			$mobile_groups = $config-&gt;get_array( 'mobile.rgroups' );

			foreach ( $mobile_groups as $mobile_group =&gt; $mobile_config ) {
				$mobile_enabled = ( isset( $mobile_config['enabled'] ) ?
					(boolean) $mobile_config['enabled'] : false );
				$mobile_agents = ( isset( $mobile_config['agents'] ) ?
					(array) $mobile_config['agents'] : '' );
				$mobile_redirect = ( isset( $mobile_config['redirect'] ) ?
					$mobile_config['redirect'] : '' );

				if ( $mobile_enabled &amp;&amp; count( $mobile_agents ) &amp;&amp; $mobile_redirect ) {
					$rules .= &quot;if (\$http_user_agent ~* \&quot;(&quot; . implode( '|',
						$mobile_agents ) . &quot;)\&quot;) {\n&quot;;
					$rules .= &quot;    rewrite .* &quot; . $mobile_redirect . &quot; last;\n&quot;;
					$rules .= &quot;}\n&quot;;
				}
			}
		}

		/**
		 * Check for referrer redirect
		 */
		if ( $config-&gt;get_boolean( 'referrer.enabled' ) ) {
			$referrer_groups = $config-&gt;get_array( 'referrer.rgroups' );

			foreach ( $referrer_groups as $referrer_group =&gt; $referrer_config ) {
				$referrer_enabled = ( isset( $referrer_config['enabled'] ) ?
					(boolean) $referrer_config['enabled'] : false );
				$referrer_referrers = ( isset( $referrer_config['referrers'] ) ?
					(array) $referrer_config['referrers'] : '' );
				$referrer_redirect = ( isset( $referrer_config['redirect'] ) ?
					$referrer_config['redirect'] : '' );

				if ( $referrer_enabled &amp;&amp; count( $referrer_referrers ) &amp;&amp;
					$referrer_redirect ) {
					$rules .= &quot;if (\$http_cookie ~* \&quot;w3tc_referrer=.*(&quot; .
						implode( '|', $referrer_referrers ) . &quot;)\&quot;) {\n&quot;;
					$rules .= &quot;    rewrite .* &quot; . $referrer_redirect . &quot; last;\n&quot;;
					$rules .= &quot;}\n&quot;;
				}
			}
		}

		/**
		 * Don't accept POSTs
		 */
		$rules .= &quot;set \$w3tc_rewrite 1;\n&quot;;
		$rules .= &quot;if (\$request_method = POST) {\n&quot;;
		$rules .= &quot;    set \$w3tc_rewrite 0;\n&quot;;
		$rules .= &quot;}\n&quot;;

		/**
		 * Query string should be empty
		 */
		$querystring_variable = ( empty( $w3tc_query_strings ) ?
			'$query_string' : '$w3tc_query_string' );

		$rules .= &quot;if (&quot; . $querystring_variable . &quot; != \&quot;\&quot;) {\n&quot;;
		$rules .= &quot;    set \$w3tc_rewrite 0;\n&quot;;
		$rules .= &quot;}\n&quot;;

		$rules .= &quot;set \$w3tc_slash \&quot;\&quot;;\n&quot;;
		$rules .= &quot;if ($env_request_uri ~ \\/$) {\n&quot;;
		$rules .= &quot;    set \$w3tc_slash _slash;\n&quot;;
		$rules .= &quot;}\n&quot;;
		$env_w3tc_slash = &quot;\$w3tc_slash&quot;;

		/**
		 * Check for rejected cookies
		 */
		$rules .= &quot;if (\$http_cookie ~* \&quot;(&quot; . implode( '|',
			array_map( array( '\W3TC\Util_Environment', 'preg_quote' ), $reject_cookies ) ) . &quot;)\&quot;) {\n&quot;;
		$rules .= &quot;    set \$w3tc_rewrite 0;\n&quot;;
		$rules .= &quot;}\n&quot;;

		/**
		 * Check for rejected user agents
		 */
		if ( count( $reject_user_agents ) ) {
			$rules .= &quot;if (\$http_user_agent ~* \&quot;(&quot; . implode( '|',
				array_map( array( '\W3TC\Util_Environment', 'preg_quote' ), $reject_user_agents ) ) . &quot;)\&quot;) {\n&quot;;
			$rules .= &quot;    set \$w3tc_rewrite 0;\n&quot;;
			$rules .= &quot;}\n&quot;;
		}

		/**
		 * Check mobile groups
		 */
		if ( $config-&gt;get_boolean( 'mobile.enabled' ) ) {
			$mobile_groups = array_reverse( $config-&gt;get_array( 'mobile.rgroups' ) );
			$set_ua_var = true;

			foreach ( $mobile_groups as $mobile_group =&gt; $mobile_config ) {
				$mobile_enabled = ( isset( $mobile_config['enabled'] ) ?
					(boolean) $mobile_config['enabled'] : false );
				$mobile_agents = ( isset( $mobile_config['agents'] ) ?
					(array) $mobile_config['agents'] : '' );
				$mobile_redirect = ( isset( $mobile_config['redirect'] ) ?
					$mobile_config['redirect'] : '' );

				if ( $mobile_enabled &amp;&amp; count( $mobile_agents ) &amp;&amp;
					!$mobile_redirect ) {
					if ( $set_ua_var ) {
						$rules .= &quot;set \$w3tc_ua \&quot;\&quot;;\n&quot;;
						$set_ua_var = false;
					}
					$rules .= &quot;if (\$http_user_agent ~* \&quot;(&quot; .
						implode( '|', $mobile_agents ) . &quot;)\&quot;) {\n&quot;;
					$rules .= &quot;    set \$w3tc_ua _&quot; . $mobile_group . &quot;;\n&quot;;
					$rules .= &quot;}\n&quot;;

					$env_w3tc_ua = &quot;\$w3tc_ua&quot;;
				}
			}
		}

		/**
		 * Check for preview cookie
		 */
		$rules .= &quot;set \$w3tc_preview \&quot;\&quot;;\n&quot;;
		$rules .= &quot;if (\$http_cookie ~* \&quot;(w3tc_preview)\&quot;) {\n&quot;;
		$rules .= &quot;    set \$w3tc_preview _preview;\n&quot;;
		$rules .= &quot;}\n&quot;;
		$env_w3tc_preview = &quot;\$w3tc_preview&quot;;

		/**
		 * Check referrer groups
		 */
		if ( $config-&gt;get_boolean( 'referrer.enabled' ) ) {
			$referrer_groups = array_reverse( $config-&gt;get_array( 'referrer.rgroups' ) );
			$set_ref_var = true;
			foreach ( $referrer_groups as $referrer_group =&gt; $referrer_config ) {
				$referrer_enabled = ( isset( $referrer_config['enabled'] ) ?
					(boolean) $referrer_config['enabled'] : false );
				$referrer_referrers = ( isset( $referrer_config['referrers'] ) ?
					(array) $referrer_config['referrers'] : '' );
				$referrer_redirect = ( isset( $referrer_config['redirect'] ) ?
					$referrer_config['redirect'] : '' );

				if ( $referrer_enabled &amp;&amp; count( $referrer_referrers ) &amp;&amp;
					!$referrer_redirect ) {
					if ( $set_ref_var ) {
						$rules .= &quot;set \$w3tc_ref \&quot;\&quot;;\n&quot;;
						$set_ref_var = false;
					}
					$rules .= &quot;if (\$http_cookie ~* \&quot;w3tc_referrer=.*(&quot; .
						implode( '|', $referrer_referrers ) . &quot;)\&quot;) {\n&quot;;
					$rules .= &quot;    set \$w3tc_ref _&quot; . $referrer_group . &quot;;\n&quot;;
					$rules .= &quot;}\n&quot;;

					$env_w3tc_ref = &quot;\$w3tc_ref&quot;;
				}
			}
		}

		/**
		 * Set cookie group
		 */
		if ( $config-&gt;get_boolean( 'pgcache.cookiegroups.enabled' ) ) {
			$cookie_groups = $config-&gt;get_array( 'pgcache.cookiegroups.groups' );
			$set_cookie_var = true;

			foreach ( $cookie_groups as $group_name =&gt; $g ) {
				if ( isset( $g['enabled'] ) &amp;&amp; $g['enabled'] ) {
					$cookies = array();
					foreach ($g['cookies'] as $cookie ) {
						$cookie = trim( $cookie );
						if ( !empty( $cookie ) ) {
							$cookie = str_replace( '+', ' ', $cookie );
							$cookie = Util_Environment::preg_quote( $cookie );
							if ( strpos( $cookie, '=') === false )
								$cookie .= '=.*';
							$cookies[] = $cookie;
						}
					}

					if ( count( $cookies ) &gt; 0 ) {
						$cookies_regexp = '&quot;^(.*;)?(' . implode( '|', $cookies ) . ')(;.*)?$&quot;';

						if ( $set_cookie_var ) {
							$rules .= &quot;set \$w3tc_cookie \&quot;\&quot;;\n&quot;;
							$set_cookie_var = false;
						}
						$rules .= &quot;if (\$http_cookie ~* $cookies_regexp) {\n&quot;;
						$rules .= &quot;    set \$w3tc_cookie _&quot; . $group_name . &quot;;\n&quot;;
						$rules .= &quot;}\n&quot;;

						$env_w3tc_cookie = &quot;\$w3tc_cookie&quot;;
					}
				}
			}
		}

		if ( $config-&gt;get_boolean( 'pgcache.cache.ssl' ) ) {
			$rules .= &quot;set \$w3tc_ssl \&quot;\&quot;;\n&quot;;

			$rules .= &quot;if (\$scheme = https) {\n&quot;;
			$rules .= &quot;    set \$w3tc_ssl _ssl;\n&quot;;
			$rules .= &quot;}\n&quot;;
			$rules .= &quot;if (\$http_x_forwarded_proto = 'https') {\n&quot;;
			$rules .= &quot;    set \$w3tc_ssl _ssl;\n&quot;;
			$rules .= &quot;}\n&quot;;

			$env_w3tc_ssl = '$w3tc_ssl';
		}

		if ( $config-&gt;get_boolean( 'browsercache.enabled' ) &amp;&amp;
			 $config-&gt;get_boolean( 'browsercache.html.brotli' ) ) {
			$rules .= &quot;set \$w3tc_enc \&quot;\&quot;;\n&quot;;

			$rules .= &quot;if (\$http_accept_encoding ~ br) {\n&quot;;
			$rules .= &quot;    set \$w3tc_enc _br;\n&quot;;
			$rules .= &quot;}\n&quot;;

			$env_w3tc_enc = '$w3tc_enc';
		}

		if ( $config-&gt;get_boolean( 'browsercache.enabled' ) &amp;&amp;
			$config-&gt;get_boolean( 'browsercache.html.compression' ) ) {
			$rules .= &quot;set \$w3tc_enc \&quot;\&quot;;\n&quot;;

			$rules .= &quot;if (\$http_accept_encoding ~ gzip) {\n&quot;;
			$rules .= &quot;    set \$w3tc_enc _gzip;\n&quot;;
			$rules .= &quot;}\n&quot;;

			$env_w3tc_enc = '$w3tc_enc';
		}

		$key_postfix = $env_w3tc_slash . $env_w3tc_ua . $env_w3tc_ref . $env_w3tc_cookie .
			$env_w3tc_ssl . $env_w3tc_preview;

		if ( $pgcache_engine == 'file_generic' ) {
			$rules .= $this-&gt;for_file_generic( $config, $cache_dir,
				$env_request_uri, $key_postfix, $env_w3tc_enc );
		} elseif ( $pgcache_engine == 'nginx_memcached' ) {
			$rules .= $this-&gt;for_nginx_memcached( $config, $cache_dir,
				$env_request_uri, $key_postfix, $env_w3tc_enc );
		}

		$rules .= W3TC_MARKER_END_PGCACHE_CORE . &quot;\n&quot;;

		return $rules;
	}


	private function for_file_generic( $config, $cache_dir, $env_request_uri,
			$key_postfix, $env_w3tc_enc ) {
		$rules = '';

		$cache_path = str_replace( Util_Environment::document_root(), '',
			$cache_dir );
		$uri_prefix = &quot;$cache_path/\$http_host/$env_request_uri/_index$key_postfix&quot;;
		$uri_prefix = apply_filters( 'w3tc_pagecache_rules_nginx_uri_prefix',
			$uri_prefix );

		if ( !$config-&gt;get_boolean( 'pgcache.cache.nginx_handle_xml' ) ) {
			$env_w3tc_ext = '.html';

			$rules .= 'if (!-f &quot;$document_root' . $uri_prefix . '.html' .
				$env_w3tc_enc . '&quot;) {' . &quot;\n&quot;;
			$rules .= '  set $w3tc_rewrite 0;' . &quot;\n&quot;;
			$rules .= &quot;}\n&quot;;
		} else {
			$env_w3tc_ext = '$w3tc_ext';

			$rules .= 'set $w3tc_ext &quot;&quot;;' . &quot;\n&quot;;
			$rules .= 'if (-f &quot;$document_root' . $uri_prefix . '.html' .
				$env_w3tc_enc . '&quot;) {' . &quot;\n&quot;;
			$rules .= '  set $w3tc_ext .html;' . &quot;\n&quot;;
			$rules .= &quot;}\n&quot;;

			$rules .= 'if (-f &quot;$document_root' . $uri_prefix . '.xml' .
				$env_w3tc_enc . '&quot;) {' . &quot;\n&quot;;
			$rules .= '    set $w3tc_ext .xml;' . &quot;\n&quot;;
			$rules .= &quot;}\n&quot;;

			$rules .= 'if ($w3tc_ext = &quot;&quot;) {' . &quot;\n&quot;;
			$rules .= '  set $w3tc_rewrite 0;' . &quot;\n&quot;;
			$rules .= &quot;}\n&quot;;
		}

		$rules .= 'if ($w3tc_rewrite = 1) {' . &quot;\n&quot;;
		$rules .= '    rewrite .* &quot;' . $uri_prefix . $env_w3tc_ext . $env_w3tc_enc .
			'&quot; last;' . &quot;\n&quot;;
		$rules .= &quot;}\n&quot;;

		return $rules;
	}


	private function for_nginx_memcached( $config, $cache_dir, $env_request_uri,
			$key_postfix, $env_w3tc_enc ) {
		$rules =  &quot;set \$request_uri_noslash $env_request_uri;\n&quot;;
		$rules .= &quot;if ($env_request_uri ~ \&quot;(.*?)(/+)$\&quot;) {\n&quot;;
		$rules .= '    set $request_uri_noslash $1;' . &quot;\n&quot;;
		$rules .= &quot;}\n&quot;;

		$cache_path = str_replace( Util_Environment::document_root(), '',
			$cache_dir );

		$rules .= 'location ~ &quot;.*(?&lt;!php)$&quot; {' . &quot;\n&quot;;
		$rules .= '  set $memcached_key &quot;$http_host$request_uri_noslash/' .
			$key_postfix . $env_w3tc_enc . '&quot;;' . &quot;\n&quot;;

		if ( $config-&gt;get_boolean( 'browsercache.enabled' ) &amp;&amp;
			$config-&gt;get_boolean( 'browsercache.html.compression' ) ) {
			$rules .= '  memcached_gzip_flag 65536;' . &quot;\n&quot;;
		   }

		$rules .= '  default_type text/html;' . &quot;\n&quot;;

		$memcached_servers = $config-&gt;get_array( 'pgcache.memcached.servers' );
		$memcached_pass = !empty( $memcached_servers ) ? array_values( $memcached_servers )[0] : 'localhost:11211';

		$rules .= '  if ($w3tc_rewrite = 1) {' . &quot;\n&quot;;
		$rules .= '    memcached_pass ' . $memcached_pass . ';' . &quot;\n&quot;;
		$rules .= &quot;  }\n&quot;;
		$rules .= '  error_page     404 502 504 = @fallback;' . &quot;\n&quot;;
		$rules .= &quot;}\n&quot;;

		$rules .= 'location @fallback {' . &quot;\n&quot;;
		$rules .= '  try_files $uri $uri/ $uri.html /index.php?$args;' . &quot;\n&quot;;
		$rules .= &quot;}\n&quot;;

		return $rules;
	}


	/*
	 * cache rules
	 */

	/**
	 * Writes directives to file cache .htaccess
	 * Throws exception on error
	 *
	 * @param Config  $config
	 * @param Util_Environment_Exceptions $exs
	 */
	private function rules_cache_add( $config, $exs ) {
		Util_Rule::add_rules( $exs,
			Util_Rule::get_pgcache_rules_cache_path(),
			$this-&gt;rules_cache_generate( $config ),
			W3TC_MARKER_BEGIN_PGCACHE_CACHE,
			W3TC_MARKER_END_PGCACHE_CACHE,
			array(
				W3TC_MARKER_BEGIN_BROWSERCACHE_CACHE =&gt; 0,
				W3TC_MARKER_BEGIN_MINIFY_CORE =&gt; 0,
				W3TC_MARKER_BEGIN_PGCACHE_CORE =&gt; 0,
				W3TC_MARKER_BEGIN_WORDPRESS =&gt; 0,
				W3TC_MARKER_END_MINIFY_CACHE =&gt; strlen( W3TC_MARKER_END_MINIFY_CACHE ) + 1
			)
		);
	}

	/**
	 * Removes Page Cache cache directives
	 *
	 * @param Util_Environment_Exceptions $exs
	 * @throws Util_WpFile_FilesystemOperationException with S/FTP form if it can't get the required filesystem credentials
	 */
	private function rules_cache_remove( $exs ) {
		// apache's cache files are not used when core rules disabled
		if ( !Util_Environment::is_nginx() )
			return;

		Util_Rule::remove_rules( $exs,
			Util_Rule::get_pgcache_rules_cache_path(),
			W3TC_MARKER_BEGIN_PGCACHE_CACHE,
			W3TC_MARKER_END_PGCACHE_CACHE );
	}

	/**
	 * Generates directives for file cache dir
	 *
	 * @param Config  $config
	 * @return string
	 */
	public function rules_cache_generate( $config ) {
		switch ( true ) {
		case Util_Environment::is_apache():
		case Util_Environment::is_litespeed():
			return $this-&gt;rules_cache_generate_apache( $config );

		case Util_Environment::is_nginx():
			return $this-&gt;rules_cache_generate_nginx( $config );
		}

		return '';
	}


	/**
	 * Generates directives for file cache dir
	 *
	 * @param Config  $config
	 * @return string
	 */
	private function rules_cache_generate_apache( $config ) {
		$charset = get_option( 'blog_charset' );
		$pingback_url = get_bloginfo( 'pingback_url' );

		$browsercache = $config-&gt;get_boolean( 'browsercache.enabled' );
		$brotli = ( $browsercache &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.brotli' ) );
		$compression = ( $browsercache &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.compression' ) );
		$expires = ( $browsercache &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.expires' ) );
		$lifetime = ( $browsercache ? $config-&gt;get_integer( 'browsercache.html.lifetime' ) : 0 );
		$cache_control = ( $browsercache &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.cache.control' ) );
		$etag = ( $browsercache &amp;&amp; $config-&gt;get_integer( 'browsercache.html.etag' ) );
		$w3tc = ( $browsercache &amp;&amp; $config-&gt;get_integer( 'browsercache.html.w3tc' ) );
		$compatibility = $config-&gt;get_boolean( 'pgcache.compatibility' );

		$rules = '';
		$rules .= W3TC_MARKER_BEGIN_PGCACHE_CACHE . &quot;\n&quot;;
		if ( $compatibility ) {
			$rules .= &quot;Options -MultiViews\n&quot;;

			// allow to read files by apache if they are blocked at some level above
			$rules .= &quot;&lt;Files ~ \&quot;\.(html|html_gzip|html_br|xml|xml_gzip|xml_br)$\&quot;&gt;\n&quot;;

			if ( version_compare( Util_Environment::get_server_version(), '2.4', '&gt;=' ) ) {
				$rules .= &quot;  Require all granted\n&quot;;
			} else {
				$rules .= &quot;  Order Allow,Deny\n&quot;;
				$rules .= &quot;  Allow from all\n&quot;;
			}

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

			if ( !$etag ) {
				$rules .= &quot;FileETag None\n&quot;;
			}
		}
		if ( $config-&gt;get_boolean( 'pgcache.file.nfs' ) ) {
			$rules .= &quot;EnableSendfile Off \n&quot;;
		}

		if ( !$config-&gt;get_boolean( 'pgcache.remove_charset' ) ) {
			$rules .= &quot;AddDefaultCharset &quot; . ( $charset ? $charset : 'utf-8' ) . &quot;\n&quot;;
		}

		if ( $etag ) {
			$rules .= &quot;FileETag MTime Size\n&quot;;
		}

		if ( $brotli ) {
			$rules .= &quot;&lt;IfModule mod_mime.c&gt;\n&quot;;
			$rules .= &quot;    AddType text/html .html_br\n&quot;;
			$rules .= &quot;    AddEncoding br .html_br\n&quot;;
			$rules .= &quot;    AddType text/xml .xml_br\n&quot;;
			$rules .= &quot;    AddEncoding br .xml_br\n&quot;;
			$rules .= &quot;&lt;/IfModule&gt;\n&quot;;
			$rules .= &quot;&lt;IfModule mod_setenvif.c&gt;\n&quot;;
			$rules .= &quot;    SetEnvIfNoCase Request_URI \\.html_br$ no-brotli\n&quot;;
			$rules .= &quot;    SetEnvIfNoCase Request_URI \\.xml_br$ no-brotli\n&quot;;
			$rules .= &quot;&lt;/IfModule&gt;\n&quot;;
		}

		if ( $compression ) {
			$rules .= &quot;&lt;IfModule mod_mime.c&gt;\n&quot;;
			$rules .= &quot;    AddType text/html .html_gzip\n&quot;;
			$rules .= &quot;    AddEncoding gzip .html_gzip\n&quot;;
			$rules .= &quot;    AddType text/xml .xml_gzip\n&quot;;
			$rules .= &quot;    AddEncoding gzip .xml_gzip\n&quot;;
			$rules .= &quot;&lt;/IfModule&gt;\n&quot;;
			$rules .= &quot;&lt;IfModule mod_setenvif.c&gt;\n&quot;;
			$rules .= &quot;    SetEnvIfNoCase Request_URI \\.html_gzip$ no-gzip\n&quot;;
			$rules .= &quot;    SetEnvIfNoCase Request_URI \\.xml_gzip$ no-gzip\n&quot;;
			$rules .= &quot;&lt;/IfModule&gt;\n&quot;;
		}

		if ( $expires ) {
			$rules .= &quot;&lt;IfModule mod_expires.c&gt;\n&quot;;
			$rules .= &quot;    ExpiresActive On\n&quot;;
			$rules .= &quot;    ExpiresByType text/html M&quot; . $lifetime . &quot;\n&quot;;
			$rules .= &quot;&lt;/IfModule&gt;\n&quot;;
		}

		$header_rules = '';

		if ( $compatibility ) {
			$header_rules .= &quot;    Header set X-Pingback \&quot;&quot; . $pingback_url . &quot;\&quot;\n&quot;;
		}

		if ( $w3tc ) {
			$header_rules .= &quot;    Header set X-Powered-By \&quot;&quot; .
				Util_Environment::w3tc_header() . &quot;\&quot;\n&quot;;
		}

		if ( $expires ) {
			$header_rules .= &quot;    Header set Vary \&quot;Accept-Encoding, Cookie\&quot;\n&quot;;
		}

		$set_last_modified = $config-&gt;get_boolean( 'browsercache.html.last_modified' );

		if ( !$set_last_modified &amp;&amp; $config-&gt;get_boolean( 'browsercache.enabled' ) ) {
			$header_rules .= &quot;    Header unset Last-Modified\n&quot;;
		}

		if ( $cache_control ) {
			$cache_policy = $config-&gt;get_string( 'browsercache.html.cache.policy' );

			switch ( $cache_policy ) {
			case 'cache':
				$header_rules .= &quot;    Header set Pragma \&quot;public\&quot;\n&quot;;
				$header_rules .= &quot;    Header set Cache-Control \&quot;public\&quot;\n&quot;;
				break;

			case 'cache_public_maxage':
				$header_rules .= &quot;    Header set Pragma \&quot;public\&quot;\n&quot;;

				if ( $expires ) {
					$header_rules .= &quot;    Header append Cache-Control \&quot;public\&quot;\n&quot;;
				} else {
					$header_rules .= &quot;    Header set Cache-Control \&quot;max-age=&quot; . $lifetime . &quot;, public\&quot;\n&quot;;
				}
				break;

			case 'cache_validation':
				$header_rules .= &quot;    Header set Pragma \&quot;public\&quot;\n&quot;;
				$header_rules .= &quot;    Header set Cache-Control \&quot;public, must-revalidate, proxy-revalidate\&quot;\n&quot;;
				break;

			case 'cache_noproxy':
				$header_rules .= &quot;    Header set Pragma \&quot;public\&quot;\n&quot;;
				$header_rules .= &quot;    Header set Cache-Control \&quot;private, must-revalidate\&quot;\n&quot;;
				break;

			case 'cache_maxage':
				$header_rules .= &quot;    Header set Pragma \&quot;public\&quot;\n&quot;;

				if ( $expires ) {
					$header_rules .= &quot;    Header append Cache-Control \&quot;public, must-revalidate, proxy-revalidate\&quot;\n&quot;;
				} else {
					$header_rules .= &quot;    Header set Cache-Control \&quot;max-age=&quot; . $lifetime . &quot;, public, must-revalidate, proxy-revalidate\&quot;\n&quot;;
				}
				break;

			case 'no_cache':
				$header_rules .= &quot;    Header set Pragma \&quot;no-cache\&quot;\n&quot;;
				$header_rules .= &quot;    Header set Cache-Control \&quot;max-age=0, private, no-store, no-cache, must-revalidate\&quot;\n&quot;;
				break;
			}
		}

		if ( strlen( $header_rules ) &gt; 0 ) {
			$rules .= &quot;&lt;IfModule mod_headers.c&gt;\n&quot;;
			$rules .= $header_rules;
			$rules .= &quot;&lt;/IfModule&gt;\n&quot;;
		}

		$rules .= W3TC_MARKER_END_PGCACHE_CACHE . &quot;\n&quot;;

		return $rules;
	}

	/**
	 * Generates directives for file cache dir
	 *
	 * @param Config  $config
	 * @return string
	 */
	private function rules_cache_generate_nginx( $config ) {
		if ( $config-&gt;get_string( 'pgcache.engine') != 'file_generic' ) {
			return '';
		}

		$cache_root = Util_Environment::normalize_path( W3TC_CACHE_PAGE_ENHANCED_DIR );
		$cache_dir = rtrim( str_replace( Util_Environment::document_root(), '', $cache_root ), '/' );

		if ( Util_Environment::is_wpmu() ) {
			$cache_dir = preg_replace( '~/w3tc.*?/~', '/w3tc.*?/', $cache_dir, 1 );
		}

		$browsercache = $config-&gt;get_boolean( 'browsercache.enabled' );
		$brotli = ( $browsercache &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.brotli' ) );
		$compression = ( $browsercache &amp;&amp; $config-&gt;get_boolean( 'browsercache.html.compression' ) );

		$common_rules_a = Dispatcher::nginx_rules_for_browsercache_section(
			$config, 'html', true );
		$common_rules = '';
		if ( !empty( $common_rules_a ) ) {
			$common_rules = '    ' . implode( &quot;\n    &quot;, $common_rules_a ) . &quot;\n&quot;;
		}

		$rules = '';
		$rules .= W3TC_MARKER_BEGIN_PGCACHE_CACHE . &quot;\n&quot;;

		if ( $brotli ) {
			$maybe_xml = '';
			if ($config-&gt;get_boolean('pgcache.cache.nginx_handle_xml')) {
				$maybe_xml = &quot;\n&quot; .
					&quot;        text/xml xml_br;\n&quot; .
					&quot;    &quot;;
			}

			$rules .= &quot;location ~ &quot; . $cache_dir . &quot;.*br$ {\n&quot;;
			$rules .= &quot;    brotli off;\n&quot;;
			$rules .= &quot;    types {&quot; . $maybe_xml . &quot;}\n&quot;;
			$rules .= &quot;    default_type text/html;\n&quot;;
			$rules .= &quot;    add_header Content-Encoding br;\n&quot;;
			$rules .= $common_rules;
			$rules .= &quot;}\n&quot;;
		}

		if ( $compression ) {
			$maybe_xml = '';
			if ($config-&gt;get_boolean('pgcache.cache.nginx_handle_xml')) {
				$maybe_xml = &quot;\n&quot; .
					&quot;        text/xml xml_gzip;\n&quot; .
					&quot;    &quot;;
			}

			$rules .= &quot;location ~ &quot; . $cache_dir . &quot;.*gzip$ {\n&quot;;
			$rules .= &quot;    gzip off;\n&quot;;
			$rules .= &quot;    types {&quot; . $maybe_xml . &quot;}\n&quot;;
			$rules .= &quot;    default_type text/html;\n&quot;;
			$rules .= &quot;    add_header Content-Encoding gzip;\n&quot;;
			$rules .= $common_rules;
			$rules .= &quot;}\n&quot;;
		}

		$rules .= W3TC_MARKER_END_PGCACHE_CACHE . &quot;\n&quot;;

		return $rules;
	}
}
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