php对象转化为数组

有如下对象$obj：

stdClass Object
(
    [name] => zhangsan
    [age] => 25
    [sex] => 1
    [innerobj] => stdClass Object
        (
            [name] => wangwu
            [age] => 24
        )

)

1.使用 (array) 转化：

print_r((array) $obj);

得：

Array
(
    [name] => zhangsan
    [age] => 25
    [sex] => 1
    [innerobj] => stdClass Object
        (
            [name] => wangwu
            [age] => 24
        )

)

(array)只能将一维对象转化为数组；

2.使用自定义函数：

function obj2arr($obj){
	$arr = array();
	foreach($obj as $k => $v){
		if(!is_object($v)){
			$arr[$k] = $v;
		}else{
			$arr[$k] = obj2arr($v);
		}
	}
	return $arr;
}

print_r(obj2arr($obj));

得：

Array
(
    [name] => zhangsan
    [age] => 25
    [sex] => 1
    [innerobj] => Array
        (
            [name] => wangwu
            [age] => 24
        )

)

3.使用json格式转化：

print_r(json_decode(json_encode($obj),true));

得：

Array
(
    [name] => zhangsan
    [age] => 25
    [sex] => 1
    [innerobj] => Array
        (
            [name] => wangwu
            [age] => 24
        )

)