public function _($translateKey, $defaultTranslation = "", $placeholders = null)
	{
		$translation = $translateKey;
		
		if (is_array($defaultTranslation) && $placeholders === null) {
			$placeholders = $defaultTranslation;
		} else {
			if ($defaultTranslation!="") {
				$translation = $defaultTranslation;
			}
		}
		if ($this->exists($translateKey)) {
			$translation = $this->_translate[$translateKey];
		}
		return $this->replacePlaceholders($translation, $placeholders);
	}