php框架之自动过滤以 自动完成

protected $fields=array('id','parentid','name','is_show');
	
	protected $_auto=array(
			array('is_hot','value',0),
			array('is_new','value',0),
			array('is_best','value',0),
			array('addtime','function','time')
	);
//自动过滤 
public function _facade($option=array()){
  	   
  	   $data=array();
  	   foreach ($option as $key=>$value){
  	   	 if (in_array($key, $this->fields)) {
  	   	 	$data[$key]=$value;
  	   	 }
  	   }
  	   return  $data;
  }
//自动填充
  public function _autoFill($data){
  	 
  	foreach($this->_auto as $value){
  		if (!array_key_exists($value[0], $data)) {
  			switch ($value[1]){
  				case 'value':
  			         $data[$value[0]]=$value[2];
  			         break;
  			    case 'function':
  			    	$data[$value[0]]=call_user_func($value[2]);
  			    	break;
  			}
  		}
  	}
  	return $data;
  }