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

/**
 * W3 FragmentCache plugin
 */
class Extension_FragmentCache_Plugin {
	private $_config = null;
	private $_core = null;

	function __construct() {
		$this-&gt;_config = Dispatcher::config();
		$this-&gt;_core = Dispatcher::component( 'Extension_FragmentCache_Core' );
	}

	/**
	 * Runs plugin
	 */
	function run() {
		add_filter( 'w3tc_config_default_values', array(
				$this, 'w3tc_config_default_values' ) );

		$config = Dispatcher::config();
		// remainder only when extension is frontend-active
		if ( !$config-&gt;is_extension_active_frontend( 'fragmentcache' ) )
			return;

		add_action( 'init', array( $this, 'on_init' ), 9999999 );

		add_filter( 'cron_schedules', array(
				$this,
				'cron_schedules'
			) );

		add_filter( 'w3tc_footer_comment', array(
				$this,
				'w3tc_footer_comment'
			) );

		if ( $this-&gt;_config-&gt;get_string( array( 'fragmentcache', 'engine' ) ) == 'file' ) {
			add_action( 'w3_fragmentcache_cleanup', array(
					$this,
					'cleanup'
				) );
		}

		add_action( 'switch_blog', array(
				$this,
				'switch_blog'
			), 0, 2 );

		$groups = $this-&gt;_config-&gt;get_array( array( 'fragmentcache', 'groups' ) );
		foreach ( $groups as $group ) {
			$split = explode( ',', $group );
			$group = array_shift( $split );
			$actions = $split;
			$this-&gt;_core-&gt;register_group( $group, $actions,
				$this-&gt;_config-&gt;get_integer( array( 'fragmentcache', 'lifetime' ) ) );
		}

		// handle transients by own cache
		if ( Util_Environment::is_w3tc_pro( $this-&gt;_config ) ) {
			$wp_cache = Dispatcher::component( 'ObjectCache_WpObjectCache' );
			$fc_cache = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
			$wp_cache-&gt;register_cache( $fc_cache, array(
					'transient', 'site-transient' ) );
		}

		// flush operations
		add_action( 'w3tc_flush_all',
			array( $this, 'w3tc_flush_all' ),
			300 );
		add_action( 'w3tc_flush_fragmentcache', array(
				$this, 'w3tc_flush_fragmentcache' ) );
		add_action( 'w3tc_flush_fragmentcache_group', array(
				$this, 'w3tc_flush_fragmentcache_group' ), 10, 2 );

		// usage statistics handling
		add_action( 'w3tc_usage_statistics_of_request', array(
				$this, 'w3tc_usage_statistics_of_request' ), 10, 1 );
		add_filter( 'w3tc_usage_statistics_metrics', array(
				$this, 'w3tc_usage_statistics_metrics' ) );
	}


	public function w3tc_config_default_values( $default_values ) {
		$default_values['fragmentcache'] = array(
			'file.gc' =&gt; 3600,
			'memcached.servers' =&gt; array( '127.0.0.1:11211' ),
			'memcached.persistent' =&gt; true,
			'redis.persistent' =&gt; true,
			'redis.servers' =&gt; array( '127.0.0.1:6379' ),
			'redis.verify_tls_certificates' =&gt; true,
			'lifetime' =&gt; 180
		);

		return $default_values;
	}


	function w3tc_flush_all() {
		$cache = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
		$cache-&gt;flush();
	}


	function w3tc_flush_fragmentcache() {
		$cache = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
		$cache-&gt;flush();
	}


	/**
	 * Cleans fragment cache
	 */
	function w3tc_flush_fragmentcache_group( $group, $global = false ) {
		$cache = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
		$cache-&gt;flush_group( $group, $global );
	}


	/**
	 * Does disk cache cleanup
	 *
	 * @return void
	 */
	function cleanup() {
		$this-&gt;_core-&gt;cleanup();
	}


	/**
	 * Cron schedules filter
	 *
	 * @param array   $schedules
	 * @return array
	 */
	function cron_schedules( $schedules ) {
		$gc_interval = $this-&gt;_config-&gt;get_integer( array( 'fragmentcache', 'file.gc' ) );

		return array_merge( $schedules, array(
				'w3_fragmentcache_cleanup' =&gt; array(
					'interval' =&gt; $gc_interval,
					'display' =&gt; sprintf( '[W3TC] Fragment Cache file GC (every %d seconds)', $gc_interval )
				),
			) );
	}


	/**
	 * Register actions on init
	 */
	function on_init() {
		do_action( 'w3tc_register_fragment_groups' );
		$actions = $this-&gt;_core-&gt;get_registered_actions();
		foreach ( $actions as $action =&gt; $groups ) {
			add_action( $action, array( $this, 'on_action' ), 0, 0 );
		}
	}


	/**
	 * Flush action
	 */
	function on_action() {
		$w3_fragmentcache = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
		$actions = $this-&gt;_core-&gt;get_registered_actions();
		$action = current_filter();
		$groups = $actions[$action];
		foreach ( $groups as $group ) {
			$w3_fragmentcache-&gt;flush_group( $group );
		}
	}


	/**
	 * Switch blog action
	 */
	function switch_blog( $blog_id, $previous_blog_id ) {
		$o = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
		$o-&gt;switch_blog( $blog_id );
	}


	public function w3tc_footer_comment( $strings ) {
		$o = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
		$strings = $o-&gt;w3tc_footer_comment( $strings );

		return $strings;
	}


	public function w3tc_usage_statistics_of_request( $storage ) {
		$o = Dispatcher::component( 'Extension_FragmentCache_WpObjectCache' );
		$o-&gt;w3tc_usage_statistics_of_request( $storage );
	}


	public function w3tc_usage_statistics_metrics( $metrics ) {
		return array_merge( $metrics, array(
				'fragmentcache_calls_total', 'fragmentcache_calls_hits' ) );
	}
}


$p = new Extension_FragmentCache_Plugin();
$p-&gt;run();

if ( is_admin() ) {
	$p = new Extension_FragmentCache_Plugin_Admin();
	$p-&gt;run();
}

include W3TC_DIR . '/Extension_FragmentCache_Api.php';
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