PHP sfFacebook::guard_adapter示例

 /**
  *
  * @return sfFacebookGuardAdapter
  * @author fabriceb
  * @since Aug 10, 2009
  * @since 2009-10-08 Alban Creton : added configurability of the Guard Adapter.
  */
 public static function getGuardAdapter()
 {
     if (self::$guard_adapter === null) {
         if (sfConfig::get('app_facebook_guard_adapter') && class_exists(sfConfig::get('app_facebook_guard_adapter'), true)) {
             $class = sfConfig::get('app_facebook_guard_adapter');
         } else {
             if (class_exists('sfGuardUserPeer', true)) {
                 $class = 'sfFacebookPropelGuardAdapter';
             } else {
                 $class = 'sfFacebookDoctrineGuardAdapter';
             }
         }
         self::$guard_adapter = new $class();
     }
     if (!self::$guard_adapter) {
         error_log('Could not create guard adapter.');
     }
     return self::$guard_adapter;
 }