AdminPageFramework_Message::getInstance PHP Метод

    public static function getInstance($sTextDomain = 'admin-page-framework')
    {
        $_oInstance = isset(self::$_aInstancesByTextDomain[$sTextDomain]) && self::$_aInstancesByTextDomain[$sTextDomain] instanceof AdminPageFramework_Message ? self::$_aInstancesByTextDomain[$sTextDomain] : new AdminPageFramework_Message($sTextDomain);
        self::$_aInstancesByTextDomain[$sTextDomain] = $_oInstance;
        return self::$_aInstancesByTextDomain[$sTextDomain];
    }

 public function __construct($aFieldTypeDefinitions, array $aFieldErrors, $oMsg = null)
 {
     $this->aFieldTypeDefinitions = $aFieldTypeDefinitions;
     $this->aFieldErrors = $aFieldErrors;
     $this->oMsg = $oMsg ? $oMsg : AdminPageFramework_Message::getInstance();
     $this->_loadScripts();
 }