[函数]清空数组函数封装

function _destruct_one($object){
    if (_is_array($object)) {
        $length = count($object);
        while($length--){
            array_splice($object,$length,1);
        }
    }
    return $object;
}
var_dump(_destruct_one([1,2,'d','key'=>'k']));  //array(0) {}