lib/fal.php
public function exists($key)
	{
		if(empty($this->meta)) return false;
		return array_key_exists($key, $this->meta);
	}
public function exists($key)
	{
		if(empty($this->meta)) return false;
		return array_key_exists($key, $this->meta);
	}
public function exists ( $ key ) { if ( empty ( $ this -> meta ) ) return false ; return array_key_exists ( $ key , $ this -> meta ) ; }
check whether meta field exists
@param $key
@return bool
check whether meta field exists