用键作为数字访问对象PHP

问题描述：

我有一个看起来像这样的对象:

I have an object that looks like this:

stdClass Object
(
    [page] => stdClass Object
        (
            [1] => stdClass Object
                (
                    [element] => stdClass Object
                        (
                            [background_color] => stdClass Object
...

当我打印print_r($arr->page)时:

stdClass Object
(
    [1] => stdClass Object
        (
            [element] => stdClass Object
                (
                    [background_color] => stdClass Object
                        (

但这不会显示任何内容:

But this prints nothing:

print_r($arr->page->{"1"});

这会显示错误:

print_r($arr->page->1);

解析错误:语法错误，意外的T_LNUMBER，预期的T_STRING或T_VARIABLE或'{'或'$'i

Parse error: syntax error, unexpected T_LNUMBER, expecting T_STRING or T_VARIABLE or '{' or '$' i

如何访问"1"元素?

How can I access the "1" element?

更新:

我也尝试过$arr->page[1]和$arr->page["1"]，但遇到此错误:

I've also tried $arr->page[1] and $arr->page["1"] but get this error:

致命错误:无法将类型为stdClass的对象用作数组中的

Fatal error: Cannot use object of type stdClass as array in

更新2:

var_dump($arr->page);

打印此:

 object(stdClass)#3 (1) {   [1]=>   
   object(stdClass)#4 (1) {
     ["element"]=>
     object(stdClass)#5 (20) {
       ["background_color"]=>
       object(stdClass)#6 (7) {

答

您不能直接访问整数类变量.最好的选择是根本不使用StdClass.

You cannot access integer class variables directly. The best option is to not use StdClass at all.

如果无法控制数据源，则可以通过$foo = (array) $foo强制转换为数组.

If you cannot control the source of your data, you can cast to an array via $foo = (array) $foo.

您还可以遍历元素:

foreach ($obj as $key=>$val)

或

foreach (get_object_vars($obj) as $key => $val)

用键作为数字访问对象PHP

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