static function getPOSTOption($prefix = null)
 {
     if (!is_null($prefix)) {
         $prefix = '_' . $prefix . '_';
     }
     $option = array();
     foreach ($_POST as $key => $value) {
         if (preg_match('/^' . PLUGIN_PAGE_BUILDER_CONTEXT . $prefix . '/', $key, $result)) {
             $index = preg_replace('/^' . PLUGIN_PAGE_BUILDER_CONTEXT . '_/', '', $key);
             $option[$index] = $value;
         }
     }
     $option = PBHelper::stripslashesPOST($option);
     return $option;
 }