/**
  * Fixes folders
  *
  * @param Config  $config
  * @param Util_Environment_Exceptions $exs
  */
 private function fix_folders($config, $exs)
 {
     // folder that we delete if exists and not writeable
     if ($config->get_boolean('minify.enabled') && $config->get_string('minify.engine') == 'file') {
         $dir = W3TC_CACHE_MINIFY_DIR;
         try {
             if (file_exists($dir) && !is_writeable($dir)) {
                 Util_WpFile::delete_folder($dir, '', $_SERVER['REQUEST_URI']);
             }
         } catch (Util_WpFile_FilesystemRmdirException $ex) {
             $exs->push($ex);
         }
     }
 }
 /**
  * Checks if addins in wp-content is available and correct version.
  *
  * @param Util_Environment_Exceptions $exs
  */
 private function create_required_folders($exs)
 {
     // folders that we create if not exists
     $directories = array(W3TC_CACHE_DIR, W3TC_CONFIG_DIR);
     foreach ($directories as $directory) {
         try {
             Util_WpFile::create_writeable_folder($directory, WP_CONTENT_DIR);
         } catch (Util_WpFile_FilesystemOperationException $ex) {
             $exs->push($ex);
         }
     }
     // folders that we delete if exists and not writeable
     $directories = array(W3TC_CACHE_TMP_DIR, W3TC_CACHE_BLOGMAP_FILENAME, W3TC_CACHE_DIR . '/object', W3TC_CACHE_DIR . '/db');
     foreach ($directories as $directory) {
         try {
             if (file_exists($directory) && !is_writeable($directory)) {
                 Util_WpFile::delete_folder($directory);
             }
         } catch (Util_WpFile_FilesystemRmdirException $ex) {
             $exs->push($ex);
         }
     }
 }
 /**
  * Fixes folders
  *
  * @param Config  $config
  * @param Util_Environment_Exceptions $exs
  */
 private function fix_folders($config, $exs)
 {
     if (!$config->get_boolean('pgcache.enabled')) {
         return;
     }
     // folder that we delete if exists and not writeable
     if ($config->get_string('pgcache.engine') == 'file_generic') {
         $dir = W3TC_CACHE_PAGE_ENHANCED_DIR;
     } else {
         if ($config->get_string('pgcache.engine') != 'file') {
             $dir = W3TC_CACHE_DIR . '/page';
         } else {
             return;
         }
     }
     try {
         if (file_exists($dir) && !is_writeable($dir)) {
             Util_WpFile::delete_folder($dir, '', $_SERVER['REQUEST_URI']);
         }
     } catch (Util_WpFile_FilesystemRmdirException $ex) {
         $exs->push($ex);
     }
 }
 /**
  *
  *
  * @param Util_Environment_Exceptions $exs
  * @param string  $path
  * @param string  $rules
  * @param string  $start
  * @param string  $end
  * @param array   $order
  */
 public static function add_rules($exs, $path, $rules, $start, $end, $order)
 {
     if (empty($path)) {
         return;
     }
     $data = @file_get_contents($path);
     if ($data === false) {
         $data = '';
     }
     $rules_missing = !empty($rules) && strstr(Util_Rule::clean_rules($data), Util_Rule::clean_rules($rules)) === false;
     if (!$rules_missing) {
         return;
     }
     $replace_start = strpos($data, $start);
     $replace_end = strpos($data, $end);
     if ($replace_start !== false && $replace_end !== false && $replace_start < $replace_end) {
         $replace_length = $replace_end - $replace_start + strlen($end) + 1;
     } else {
         $replace_start = false;
         $replace_length = 0;
         $search = $order;
         foreach ($search as $string => $length) {
             $replace_start = strpos($data, $string);
             if ($replace_start !== false) {
                 $replace_start += $length;
                 break;
             }
         }
     }
     if ($replace_start !== false) {
         $data = Util_Rule::trim_rules(substr_replace($data, $rules, $replace_start, $replace_length));
     } else {
         $data = Util_Rule::trim_rules($data . $rules);
     }
     if (strpos($path, W3TC_CACHE_DIR) === false || Util_Environment::is_nginx()) {
         try {
             Util_WpFile::write_to_file($path, $data);
         } catch (Util_WpFile_FilesystemOperationException $ex) {
             if ($replace_start !== false) {
                 $exs->push(new Util_WpFile_FilesystemModifyException($ex->getMessage(), $ex->credentials_form(), sprintf(__('Edit file <strong>%s
                         </strong> and replace all lines between and including <strong>%s</strong> and
                         <strong>%s</strong> markers with:', 'w3-total-caceh'), $path, $start, $end), $path, $rules));
             } else {
                 $exs->push(new Util_WpFile_FilesystemModifyException($ex->getMessage(), $ex->credentials_form(), sprintf(__('Edit file <strong>%s</strong> and add the following rules
                                 above the WordPress directives:', 'w3-total-cache'), $path), $path, $rules));
             }
             return;
         }
     } else {
         if (!@file_exists(dirname($path))) {
             Util_File::mkdir_from(dirname($path), W3TC_CACHE_DIR);
         }
         if (!@file_put_contents($path, $data)) {
             try {
                 Util_WpFile::delete_folder(dirname($path), '', $_SERVER['REQUEST_URI']);
             } catch (Util_WpFile_FilesystemOperationException $ex) {
                 $exs->push($ex);
                 return;
             }
         }
     }
     Util_Rule::after_rules_modified();
 }