public function getKey($key) {
		$out = NULL;
		if ($this->hasKey($key)) {
			$out = $this->key[$key];
			unset($this->key[$key]);
		}
		return $out;
	}
public function getKey($key) {
		$out = NULL;
		if ($this->hasKey($key)) {
			$out = $this->key[$key];
			unset($this->key[$key]);
		}
		return $out;
	}
public function getKey ( $ key ) { $ out = NULL ; if ( $ this -> hasKey ( $ key ) ) { $ out = $ this -> key [ $ key ] ; unset ( $ this -> key [ $ key ] ) ; } return $ out ; }
get and clear a flash key, if it's existing
@param $key
@return mixed|null
get and clear a flash key if it s existing