<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: autoptimizeCache.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
/**
 * Handles disk-cache-related operations.
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class autoptimizeCache
{
    /**
     * Cache filename.
     *
     * @var string
     */
    private $filename;

    /**
     * Cache directory path (with a trailing slash).
     *
     * @var string
     */
    private $cachedir;

    /**
     * Whether gzipping is done by the web server or us.
     * True =&gt; we don't gzip, the web server does it.
     * False =&gt; we do it ourselves.
     *
     * @var bool
     */
    private $nogzip;

    /**
     * Ctor.
     *
     * @param string $md5 Hash.
     * @param string $ext Extension.
     */
    public function __construct( $md5, $ext = 'php' )
    {
        $_min_ext = '';
        if ( apply_filters( 'autoptimize_filter_cache_url_add_min_ext', false ) ) {
            $_min_ext = '.min';
        }

        $this-&gt;cachedir = AUTOPTIMIZE_CACHE_DIR;
        $this-&gt;nogzip   = AUTOPTIMIZE_CACHE_NOGZIP;
        if ( ! $this-&gt;nogzip ) {
            $this-&gt;filename = AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . $_min_ext . '.php';
        } else {
            if ( in_array( $ext, array( 'js', 'css' ) ) ) {
                $this-&gt;filename = $ext . '/' . AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . $_min_ext . '.' . $ext;
            } else {
                $this-&gt;filename = AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . $_min_ext . '.' . $ext;
            }
        }
    }

    /**
     * Returns true if the cached file exists on disk.
     *
     * @return bool
     */
    public function check()
    {
        return file_exists( $this-&gt;cachedir . $this-&gt;filename );
    }

    /**
     * Returns cache contents if they exist, false otherwise.
     *
     * @return string|false
     */
    public function retrieve()
    {
        if ( $this-&gt;check() ) {
            if ( false == $this-&gt;nogzip ) {
                return file_get_contents( $this-&gt;cachedir . $this-&gt;filename . '.none' );
            } else {
                return file_get_contents( $this-&gt;cachedir . $this-&gt;filename );
            }
        }
        return false;
    }

    /**
     * Stores given $data in cache.
     *
     * @param string $data Data to cache.
     * @param string $mime Mimetype.
     *
     * @return void|bool
     */
    public function cache( $data, $mime )
    {
        // readonly FS explicitly OK'ed by developer, so just pretend all is OK.
        if ( defined( 'AUTOPTIMIZE_CACHE_READONLY' ) ) {
            return true;
        }

        // off by default; check if cachedirs exist every time before caching
        //
        // to be activated for users that experience these ugly errors;
        // PHP Warning: file_put_contents failed to open stream: No such file or directory.
        if ( apply_filters( 'autoptimize_filter_cache_checkdirs_on_write', false ) ) {
            $this-&gt;check_and_create_dirs();
        }

        if ( false === $this-&gt;nogzip ) {
            // We handle gzipping ourselves.
            $file    = 'default.php';
            $phpcode = file_get_contents( AUTOPTIMIZE_PLUGIN_DIR . 'config/' . $file );
            $phpcode = str_replace( array( '%%CONTENT%%', 'exit;' ), array( $mime, '' ), $phpcode );

            file_put_contents( $this-&gt;cachedir . $this-&gt;filename, $phpcode );
            file_put_contents( $this-&gt;cachedir . $this-&gt;filename . '.none', $data );
        } else {
            // Write code to cache without doing anything else.
            file_put_contents( $this-&gt;cachedir . $this-&gt;filename, $data );

            // save fallback .js or .css file if filter true (to be false by default) but not if snippet or single.
            if ( self::do_fallback() &amp;&amp; strpos( $this-&gt;filename, '_snippet_' ) === false &amp;&amp; strpos( $this-&gt;filename, '_single_' ) === false ) {
                $_extension     = pathinfo( $this-&gt;filename, PATHINFO_EXTENSION );
                $_fallback_file = AUTOPTIMIZE_CACHEFILE_PREFIX . 'fallback.' . $_extension;
                if ( ( 'css' === $_extension || 'js' === $_extension ) &amp;&amp; ! file_exists( $this-&gt;cachedir . $_extension . '/' . $_fallback_file ) ) {
                    file_put_contents( $this-&gt;cachedir . $_extension . '/' . $_fallback_file, $data );
                }
            }

            if ( apply_filters( 'autoptimize_filter_cache_create_static_gzip', false ) ) {
                // Create an additional cached gzip file.
                file_put_contents( $this-&gt;cachedir . $this-&gt;filename . '.gz', gzencode( $data, 9, FORCE_GZIP ) );
                // If PHP Brotli extension is installed, create an additional cached Brotli file.
                if ( function_exists( 'brotli_compress' ) ) {
                    file_put_contents( $this-&gt;cachedir . $this-&gt;filename . '.br', brotli_compress( $data, 11, BROTLI_GENERIC ) );
                }
            }
        }

        // Provide 3rd party action hook for every cache file that is created.
        // This hook can for example be used to inject a copy of the created cache file to a other domain.
        do_action( 'autoptimize_action_cache_file_created', $this-&gt;cachedir . $this-&gt;filename );
    }

    /**
     * Get cache filename.
     *
     * @return string
     */
    public function getname()
    {
        // NOTE: This could've maybe been a do_action() instead, however,
        // that ship has sailed.
        // The original idea here was to provide 3rd party code a hook so that
        // it can &quot;listen&quot; to all the complete autoptimized-urls that the page
        // will emit... Or something to that effect I think?
        apply_filters( 'autoptimize_filter_cache_getname', AUTOPTIMIZE_CACHE_URL . $this-&gt;filename );

        return $this-&gt;filename;
    }

    /**
     * Returns true if given `$file` is considered a valid Autoptimize cache file,
     * false otherwise.
     *
     * @param string $dir Directory name (with a trailing slash).
     * @param string $file Filename.
     * @return bool
     */
    protected static function is_valid_cache_file( $dir, $file )
    {
        if ( '.' !== $file &amp;&amp; '..' !== $file &amp;&amp;
            false !== strpos( $file, AUTOPTIMIZE_CACHEFILE_PREFIX ) &amp;&amp;
            is_file( $dir . $file ) ) {

            // It's a valid file!
            return true;
        }

        // Everything else is considered invalid!
        return false;
    }

    /**
     * Clears contents of AUTOPTIMIZE_CACHE_DIR.
     *
     * @return void
     */
    protected static function clear_cache_classic()
    {
        $contents = self::get_cache_contents();
        foreach ( $contents as $name =&gt; $files ) {
            $dir = rtrim( AUTOPTIMIZE_CACHE_DIR . $name, '/' ) . '/';
            foreach ( $files as $file ) {
                if ( self::is_valid_cache_file( $dir, $file ) ) {
                    @unlink( $dir . $file ); // @codingStandardsIgnoreLine
                }
            }
        }

        @unlink( AUTOPTIMIZE_CACHE_DIR . '/.htaccess' ); // @codingStandardsIgnoreLine
    }

    /**
     * Recursively deletes the specified pathname (file/directory) if possible.
     * Returns true on success, false otherwise.
     *
     * @param string $pathname Pathname to remove.
     *
     * @return bool
     */
    protected static function rmdir( $pathname )
    {
        $files = self::get_dir_contents( $pathname );
        foreach ( $files as $file ) {
            $path = $pathname . '/' . $file;
            if ( is_dir( $path ) ) {
                self::rmdir( $path );
            } else {
                unlink( $path );
            }
        }

        return rmdir( $pathname );
    }

    /**
     * Clears contents of AUTOPTIMIZE_CACHE_DIR by renaming the current
     * cache directory into a new one with a unique name and then
     * re-creating the default (empty) cache directory.
     *
     * Important/ Fixme: this does not take multisite into account, so
     * if advanced_cache_clear_enabled is true (it is not by default)
     * then the content for all subsites is zapped!
     *
     * @return bool Returns true when everything is done successfully, false otherwise.
     */
    protected static function clear_cache_via_rename()
    {
        $ok       = false;
        $dir      = self::get_pathname_base();
        $new_name = self::get_unique_name();

        // Makes sure the new pathname is on the same level...
        $new_pathname = dirname( $dir ) . '/' . $new_name;
        $renamed      = @rename( $dir, $new_pathname ); // @codingStandardsIgnoreLine

        // When renamed, re-create the default cache directory back so it's
        // available again...
        if ( $renamed ) {
            $ok = self::cacheavail();
        }

        return $ok;
    }

    /**
     * Returns true when advanced cache clearing is enabled.
     *
     * @return bool
     */
    public static function advanced_cache_clear_enabled()
    {
        return apply_filters( 'autoptimize_filter_cache_clear_advanced', false );
    }

    /**
     * Returns a (hopefully) unique new cache folder name for renaming purposes.
     *
     * @return string
     */
    protected static function get_unique_name()
    {
        $prefix   = self::get_advanced_cache_clear_prefix();
        $new_name = uniqid( $prefix, true );

        return $new_name;
    }

    /**
     * Get cache prefix name used in advanced cache clearing mode.
     *
     * @return string
     */
    protected static function get_advanced_cache_clear_prefix()
    {
        $pathname = self::get_pathname_base();
        $basename = basename( $pathname );
        $prefix   = $basename . '-artifact-';

        return $prefix;
    }

    /**
     * Returns an array of file and directory names found within
     * the given $pathname without '.' and '..' elements.
     *
     * @param string $pathname Pathname.
     *
     * @return array
     */
    protected static function get_dir_contents( $pathname )
    {
        return array_slice( scandir( $pathname ), 2 );
    }

    /**
     * Wipes directories which were created as part of the fast cache clearing
     * routine (which renames the current cache directory into a new one with
     * a custom-prefixed unique name).
     *
     * @return bool
     */
    public static function delete_advanced_cache_clear_artifacts()
    {
        // Don't go through these motions (called from the cachechecker) if advanced cache clear isn't even active.
        if ( ! self::advanced_cache_clear_enabled() ) {
            return false;
        }

        $dir    = self::get_pathname_base();
        $prefix = self::get_advanced_cache_clear_prefix();
        $parent = dirname( $dir );
        $ok     = false;

        // Returns the list of files without '.' and '..' elements.
        $files = self::get_dir_contents( $parent );
        if ( is_array( $files ) &amp;&amp; ! empty( $files ) ) {
            foreach ( $files as $file ) {
                $path     = $parent . '/' . $file;
                $prefixed = ( false !== strpos( $path, $prefix ) );
                // Removing only our own (prefixed) directories...
                if ( is_dir( $path ) &amp;&amp; $prefixed ) {
                    $ok = self::rmdir( $path );
                }
            }
        }

        return $ok;
    }

    /**
     * Returns the cache directory pathname used.
     * Done as a function so we canSlightly different
     * if multisite is used and `autoptimize_separate_blog_caches` filter
     * is used.
     *
     * @return string
     */
    public static function get_pathname()
    {
        $pathname = self::get_pathname_base();

        if ( is_multisite() &amp;&amp; apply_filters( 'autoptimize_separate_blog_caches', true ) ) {
            $blog_id   = get_current_blog_id();
            $pathname .= $blog_id . '/';
        }

        return $pathname;
    }

    /**
     * Returns the base path of our cache directory.
     *
     * @return string
     */
    protected static function get_pathname_base()
    {
        $pathname = WP_CONTENT_DIR . AUTOPTIMIZE_CACHE_CHILD_DIR;

        return $pathname;
    }

    /**
     * Deletes everything from the cache directories.
     *
     * @param bool $propagate Whether to trigger additional actions when cache is purged.
     *
     * @return bool
     */
    public static function clearall( $propagate = true )
    {
        if ( defined( 'ET_CORE_VERSION' ) &amp;&amp; 'Divi' === get_template() ) {
            // see https://blog.futtta.be/2018/11/17/warning-divi-purging-autoptimizes-cache/ .
            $dbt    = debug_backtrace( DEBUG_BACKTRACE_IGNORE_ARGS, 2 );
            $caller = isset( $dbt[1]['function'] ) ? $dbt[1]['function'] : null;
            if ( 'et_core_clear_wp_cache' === $caller ) {
                _doing_it_wrong( 'autoptimizeCache::clearall', 'Divi devs: please don\'t clear Autoptimize\'s cache, it is unneeded and can break sites. You can contact me at futtta@gmail.com to discuss.', 'Autoptimize 2.9.6' );
                return false;
            }
        }

        if ( ! self::cacheavail() || true === apply_filters( 'autoptimize_filter_cache_clearall_disabled', false ) ) {
            return false;
        }

        // TODO/FIXME: If cache is big, switch to advanced/new cache clearing automatically?
        if ( self::advanced_cache_clear_enabled() ) {
            self::clear_cache_via_rename();
        } else {
            self::clear_cache_classic();
        }

        // Remove 404 handler if required.
        if ( self::do_fallback() ) {
            $_fallback_php = trailingslashit( WP_CONTENT_DIR ) . 'autoptimize_404_handler.php';
            @unlink( $_fallback_php ); // @codingStandardsIgnoreLine
        }

        // Remove the transient so it gets regenerated...
        delete_transient( 'autoptimize_stats' );

        // Cache was just purged, clear page cache and allow others to hook into our purging...
        if ( true === $propagate ) {
            if ( ! function_exists( 'autoptimize_do_cachepurged_action' ) ) {
                function autoptimize_do_cachepurged_action() {
                    do_action( 'autoptimize_action_cachepurged' );
                }
            }
            add_action( 'shutdown', 'autoptimize_do_cachepurged_action', 11 );
            add_action( 'autoptimize_action_cachepurged', array( 'autoptimizeCache', 'flushPageCache' ), 10, 0 );
        }

        // Warm cache (part of speedupper)!
        if ( apply_filters( 'autoptimize_filter_speedupper', true ) &amp;&amp; false == get_transient( 'autoptimize_cache_warmer_protector' ) ) {
            set_transient( 'autoptimize_cache_warmer_protector', 'I shall not warm cache for another 10 minutes.', 60 * 10 );
            $url   = site_url() . '/?ao_speedup_cachebuster=' . rand( 1, 100000 );
            $url   = apply_filters( 'autoptimize_filter_cache_warmer_url', $url );
            $cache = @wp_remote_get( $url ); // @codingStandardsIgnoreLine
            unset( $cache );
        }

        return true;
    }

    /**
     * Wrapper for clearall but with false param
     * to ensure the event is not propagated to others
     * through our own hooks (to avoid infinite loops).
     *
     * @return bool
     */
    public static function clearall_actionless()
    {
        return self::clearall( false );
    }

    /**
     * Returns the contents of our cache dirs.
     *
     * @return array
     */
    protected static function get_cache_contents()
    {
        $contents = array();

        foreach ( array( '', 'js', 'css' ) as $dir ) {
            $contents[ $dir ] = scandir( AUTOPTIMIZE_CACHE_DIR . $dir );
        }

        return $contents;
    }

    /**
     * Returns stats about cached contents.
     *
     * @return array
     */
    public static function stats()
    {
        $stats = get_transient( 'autoptimize_stats' );

        // If no transient, do the actual scan!
        if ( ! is_array( $stats ) ) {
            if ( ! self::cacheavail() ) {
                return 0;
            }
            $stats = self::stats_scan();
            $count = $stats[0];
            if ( $count &gt; 100 ) {
                // Store results in transient.
                set_transient(
                    'autoptimize_stats',
                    $stats,
                    apply_filters( 'autoptimize_filter_cache_statsexpiry', HOUR_IN_SECONDS )
                );
            }
        }

        return $stats;
    }

    /**
     * Performs a scan of cache directory contents and returns an array
     * with 3 values: count, size, timestamp.
     * count = total number of found files
     * size = total filesize (in bytes) of found files
     * timestamp = unix timestamp when the scan was last performed/finished.
     *
     * @return array
     */
    protected static function stats_scan()
    {
        $count = 0;
        $size  = 0;

        // Scan everything in our cache directories.
        foreach ( self::get_cache_contents() as $name =&gt; $files ) {
            $dir = rtrim( AUTOPTIMIZE_CACHE_DIR . $name, '/' ) . '/';
            foreach ( $files as $file ) {
                if ( self::is_valid_cache_file( $dir, $file ) ) {
                    if ( AUTOPTIMIZE_CACHE_NOGZIP &amp;&amp;
                        (
                            false !== strpos( $file, '.js' ) ||
                            false !== strpos( $file, '.css' ) ||
                            false !== strpos( $file, '.img' ) ||
                            false !== strpos( $file, '.txt' )
                        )
                    ) {
                        // Web server is gzipping, we count .js|.css|.img|.txt files.
                        $count++;
                    } elseif ( ! AUTOPTIMIZE_CACHE_NOGZIP &amp;&amp; false !== strpos( $file, '.none' ) ) {
                        // We are gzipping ourselves via php, counting only .none files.
                        $count++;
                    }
                    $size += filesize( $dir . $file );
                }
            }
        }

        $stats = array( $count, $size, time() );

        return $stats;
    }

    /**
     * Ensures the cache directory exists, is writeable and contains the
     * required .htaccess files.
     * Returns false in case it fails to ensure any of those things.
     *
     * @return bool
     */
    public static function cacheavail()
    {
        // readonly FS explicitly OK'ed by dev, let's assume the cache dirs are there!
        if ( defined( 'AUTOPTIMIZE_CACHE_READONLY' ) ) {
            return true;
        }

        if ( false === autoptimizeCache::check_and_create_dirs() ) {
            return false;
        }

        // Using .htaccess inside our cache folder to overrule wp-super-cache.
        $htaccess = AUTOPTIMIZE_CACHE_DIR . '/.htaccess';
        if ( ! is_file( $htaccess ) ) {
            /**
             * Create `wp-content/AO_htaccess_tmpl` file with
             * whatever htaccess rules you might need
             * if you want to override default AO htaccess
             */
            $htaccess_tmpl = WP_CONTENT_DIR . '/AO_htaccess_tmpl';
            if ( is_file( $htaccess_tmpl ) ) {
                $content = file_get_contents( $htaccess_tmpl );
            } elseif ( is_multisite() || ! AUTOPTIMIZE_CACHE_NOGZIP ) {
                $content = '&lt;IfModule mod_expires.c&gt;
        ExpiresActive On
        ExpiresByType text/css A30672000
        ExpiresByType text/javascript A30672000
        ExpiresByType application/javascript A30672000
&lt;/IfModule&gt;
&lt;IfModule mod_headers.c&gt;
    Header append Cache-Control &quot;public, immutable&quot;
&lt;/IfModule&gt;
&lt;IfModule mod_deflate.c&gt;
        &lt;FilesMatch &quot;\.(js|css)$&quot;&gt;
        SetOutputFilter DEFLATE
    &lt;/FilesMatch&gt;
&lt;/IfModule&gt;
&lt;IfModule mod_authz_core.c&gt;
    &lt;Files *.php&gt;
        Require all granted
    &lt;/Files&gt;
&lt;/IfModule&gt;
&lt;IfModule !mod_authz_core.c&gt;
    &lt;Files *.php&gt;
        Order allow,deny
        Allow from all
    &lt;/Files&gt;
&lt;/IfModule&gt;';
            } else {
                $content = '&lt;IfModule mod_expires.c&gt;
        ExpiresActive On
        ExpiresByType text/css A30672000
        ExpiresByType text/javascript A30672000
        ExpiresByType application/javascript A30672000
&lt;/IfModule&gt;
&lt;IfModule mod_headers.c&gt;
    Header append Cache-Control &quot;public, immutable&quot;
&lt;/IfModule&gt;
&lt;IfModule mod_deflate.c&gt;
    &lt;FilesMatch &quot;\.(js|css)$&quot;&gt;
        SetOutputFilter DEFLATE
    &lt;/FilesMatch&gt;
&lt;/IfModule&gt;
&lt;IfModule mod_authz_core.c&gt;
    &lt;Files *.php&gt;
        Require all denied
    &lt;/Files&gt;
&lt;/IfModule&gt;
&lt;IfModule !mod_authz_core.c&gt;
    &lt;Files *.php&gt;
        Order deny,allow
        Deny from all
    &lt;/Files&gt;
&lt;/IfModule&gt;';
            }

            if ( self::do_fallback() === true ) {
                $content .= &quot;\nErrorDocument 404 &quot; . trailingslashit( parse_url( content_url(), PHP_URL_PATH ) ) . 'autoptimize_404_handler.php';
            }
            @file_put_contents( $htaccess, $content ); // @codingStandardsIgnoreLine
        }

        if ( self::do_fallback() ) {
            self::check_fallback_php();
        }

        // All OK!
        return true;
    }

    /**
     * Checks if fallback-php file exists and create it if not.
     *
     * Return bool
     */
    public static function check_fallback_php() {
        $_fallback_filename = 'autoptimize_404_handler.php';
        $_fallback_php      = trailingslashit( WP_CONTENT_DIR ) . $_fallback_filename;
        $_fallback_status   = true;

        if ( ! file_exists( $_fallback_php ) &amp;&amp; is_writable( WP_CONTENT_DIR ) ) {
            $_fallback_php_contents = file_get_contents( AUTOPTIMIZE_PLUGIN_DIR . 'config/' . $_fallback_filename );
            $_fallback_php_contents = str_replace( '&lt;?php exit;', '&lt;?php', $_fallback_php_contents );
            $_fallback_php_contents = str_replace( '&lt;!--ao-cache-dir--&gt;', AUTOPTIMIZE_CACHE_DIR, $_fallback_php_contents );
            $_fallback_php_contents = str_replace( '&lt;!--ao-cachefile-prefix--&gt;', AUTOPTIMIZE_CACHEFILE_PREFIX, $_fallback_php_contents );
            if ( is_multisite() ) {
                $_fallback_php_contents = str_replace( '$multisite = false;', '$multisite = true;', $_fallback_php_contents );
            }
            if ( apply_filters( 'autoptimize_filter_cache_fallback_log_errors', false ) ) {
                $_fallback_php_contents = str_replace( '// error_log', 'error_log', $_fallback_php_contents );
            }
            $_fallback_status = file_put_contents( $_fallback_php, $_fallback_php_contents );
        }

        return $_fallback_status;
    }

    /**
     * Tells if AO should try to avoid 404's by creating fallback filesize
     * and create a php 404 handler and tell .htaccess to redirect to said handler
     * and hook into WordPress to redirect 404 to said handler as well. NGINX users
     * are smart enough to get this working, no? ;-)
     *
     * Return bool
     */
    public static function do_fallback() {
        static $_do_fallback = null;

        if ( null === $_do_fallback ) {
            $_do_fallback = (bool) apply_filters( 'autoptimize_filter_cache_do_fallback', autoptimizeOptionWrapper::get_option( 'autoptimize_cache_fallback', '1' ) );
        }

        return $_do_fallback;
    }

    /**
     * Hooks into template_redirect, will act on 404-ing requests for
     * Autoptimized files and redirects to the fallback CSS/ JS if available
     * and 410'ing (&quot;Gone&quot;) if fallback not available.
     */
    public static function wordpress_notfound_fallback() {
        $original_request = strtok( $_SERVER['REQUEST_URI'], '?' );
        if ( strpos( $original_request, wp_basename( WP_CONTENT_DIR ) . AUTOPTIMIZE_CACHE_CHILD_DIR ) !== false &amp;&amp; is_404() ) {
            // make sure this is not considered a 404.
            global $wp_query;
            $wp_query-&gt;is_404 = false;

            // set fallback path.
            $js_or_css     = pathinfo( $original_request, PATHINFO_EXTENSION );
            $fallback_path = AUTOPTIMIZE_CACHE_DIR . $js_or_css . '/autoptimize_fallback.' . $js_or_css;

            // prepare for Shakeeb's Unused CSS files to be 404-handled as well.
            if ( strpos( $original_request, 'uucss/uucss-' ) !== false ) {
                $original_request = preg_replace( '/uucss\/uucss-[a-z0-9]{32}-/', 'css/', $original_request );
            }

            // set fallback URL.
            $fallback_target = preg_replace( '/(.*)_(?:[a-z0-9]{32})\.(js|css)$/', '${1}_fallback.${2}', $original_request );

            // redirect to fallback if possible.
            if ( $original_request !== $fallback_target &amp;&amp; file_exists( $fallback_path ) ) {
                // redirect to fallback.
                wp_redirect( $fallback_target, 302 );
            } else {
                // return HTTP 410 (gone) reponse.
                status_header( 410 );
            }
        }
    }

    /**
     * Checks if cache dirs exist and create if not.
     * Returns false if not succesful.
     *
     * @return bool
     */
    public static function check_and_create_dirs() {
        if ( ! defined( 'AUTOPTIMIZE_CACHE_DIR' ) ) {
            // We didn't set a cache.
            return false;
        }

        foreach ( array( '', 'js', 'css' ) as $dir ) {
            if ( ! self::check_cache_dir( AUTOPTIMIZE_CACHE_DIR . $dir ) ) {
                return false;
            }
        }
        return true;
    }

    /**
     * Ensures the specified `$dir` exists and is writeable.
     * Returns false if that's not the case.
     *
     * @param string $dir Directory to check/create.
     *
     * @return bool
     */
    protected static function check_cache_dir( $dir )
    {
        // Try creating the dir if it doesn't exist.
        if ( ! file_exists( $dir ) ) {
            @mkdir( $dir, 0775, true ); // @codingStandardsIgnoreLine
            if ( ! file_exists( $dir ) ) {
                return false;
            }
        }

        // If we still cannot write, bail.
        if ( ! is_writable( $dir ) ) {
            return false;
        }

        // Create an index.html in there to avoid prying eyes!
        $idx_file = rtrim( $dir, '/\\' ) . '/index.html';
        if ( ! is_file( $idx_file ) ) {
            @file_put_contents( $idx_file, '&lt;html&gt;&lt;head&gt;&lt;meta name=&quot;robots&quot; content=&quot;noindex, nofollow&quot;&gt;&lt;/head&gt;&lt;body&gt;Generated by &lt;a href=&quot;http://wordpress.org/extend/plugins/autoptimize/&quot; rel=&quot;nofollow&quot;&gt;Autoptimize&lt;/a&gt;&lt;/body&gt;&lt;/html&gt;' ); // @codingStandardsIgnoreLine
        }

        return true;
    }

    /**
     * Flushes as many page cache plugin's caches as possible.
     *
     * @return void
     */
    // @codingStandardsIgnoreStart
    public static function flushPageCache()
    {
        if ( function_exists( 'wp_cache_clear_cache' ) ) {
            if ( is_multisite() ) {
                $blog_id = get_current_blog_id();
                wp_cache_clear_cache( $blog_id );
            } else {
                wp_cache_clear_cache();
            }
        } elseif ( has_action( 'cachify_flush_cache' ) ) {
            do_action( 'cachify_flush_cache' );
        } elseif ( function_exists( 'w3tc_pgcache_flush' ) ) {
            w3tc_pgcache_flush();
        } elseif ( function_exists( 'wp_fast_cache_bulk_delete_all' ) ) {
            wp_fast_cache_bulk_delete_all();
        } elseif ( function_exists( 'rapidcache_clear_cache' ) ) {
            rapidcache_clear_cache();
        } elseif ( class_exists( 'Swift_Performance_Cache' ) ) {
            Swift_Performance_Cache::clear_all_cache();
        } elseif ( class_exists( 'WpFastestCache' ) ) {
            $wpfc = new WpFastestCache();
            $wpfc-&gt;deleteCache();
        } elseif ( class_exists( 'c_ws_plugin__qcache_purging_routines' ) ) {
            c_ws_plugin__qcache_purging_routines::purge_cache_dir(); // quick cache
        } elseif ( class_exists( 'zencache' ) ) {
            zencache::clear();
        } elseif ( class_exists( 'comet_cache' ) ) {
            comet_cache::clear();
        } elseif ( class_exists( 'WpeCommon' ) ) {
            // WPEngine cache purge/flush methods to call by default
            $wpe_methods = array(
                'purge_varnish_cache',
            );

            // More agressive clear/flush/purge behind a filter
            if ( apply_filters( 'autoptimize_flush_wpengine_aggressive', false ) ) {
                $wpe_methods = array_merge( $wpe_methods, array( 'purge_memcached', 'clear_maxcdn_cache' ) );
            }

            // Filtering the entire list of WpeCommon methods to be called (for advanced usage + easier testing)
            $wpe_methods = apply_filters( 'autoptimize_flush_wpengine_methods', $wpe_methods );

            foreach ( $wpe_methods as $wpe_method ) {
                if ( method_exists( 'WpeCommon', $wpe_method ) ) {
                    WpeCommon::$wpe_method();
                }
            }
        } elseif ( function_exists( 'sg_cachepress_purge_cache' ) ) {
            sg_cachepress_purge_cache();
        } elseif ( array_key_exists( 'KINSTA_CACHE_ZONE', $_SERVER ) ) {
            $_kinsta_clear_cache_url = 'https://localhost/kinsta-clear-cache-all';
            $_kinsta_response        = wp_remote_get(
                $_kinsta_clear_cache_url,
                array(
                    'sslverify' =&gt; false,
                    'timeout' =&gt; 5,
                    )
            );
        } elseif ( class_exists( 'RaidboxesNginxCacheFunctions' ) ) {
            $rb_cache_helper = new RaidboxesNginxCacheFunctions();
            $rb_cache_helper-&gt;purge_cache();
        } elseif ( defined('NGINX_HELPER_BASENAME') ) {
            do_action( 'rt_nginx_helper_purge_all' );
        } elseif ( file_exists( WP_CONTENT_DIR . '/wp-cache-config.php' ) &amp;&amp; function_exists( 'prune_super_cache' ) ) {
            // fallback for WP-Super-Cache
            global $cache_path;
            if ( is_multisite() ) {
                $blog_id = get_current_blog_id();
                prune_super_cache( get_supercache_dir( $blog_id ), true );
                prune_super_cache( $cache_path . 'blogs/', true );
            } else {
                prune_super_cache( $cache_path . 'supercache/', true );
                prune_super_cache( $cache_path, true );
            }
        } elseif ( class_exists( 'NginxCache' ) ) {
            $nginx_cache = new NginxCache();
            $nginx_cache-&gt;purge_zone_once();
        }
    }
    // @codingStandardsIgnoreEnd
}
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