如何访问php花括号对象属性

如何访问php花括号对象属性,php,object,properties,curly-braces,curly-brackets,Php,Object,Properties,Curly Braces,Curly Brackets,可能重复: print\r($myObj)给出以下结果: stdClass Object ( [4021450] => stdClass Object ( [property1] => ooo [property2] => xxx ) [3971601] => stdClass Object ( [property1] => 123 [property2] =&

可能重复:

print\r($myObj)
给出以下结果:

stdClass Object
(
    [4021450] => stdClass Object
    (
        [property1] => ooo
        [property2] => xxx
    )
    [3971601] => stdClass Object
    (
        [property1] => 123
        [property2] => 356
    )
)
如何使用带变量的大括号语法访问
子对象

我试过:

$myObj->'3971601';                     // Parse error: syntax error  
$myObj->{'3971601'};                   // Works  
$id = 3971601; $myObj->{$id};          // Notice: Trying to get property of non-object  
$id = 3971601; $myObj->{''.$id};       // Notice: Trying to get property of non-object  
$arr = (array)$myObj; $arr[3971601];   // Notice: Undefined offset: 3971601
$arr = (array)$myObj; $arr['3971601']; // Notice: Undefined index: 3971601

您应该能够完全省略大括号:
$myObj->$id
。然而,你最后的4个例子表明有些地方不对劲。似乎在某个地方,
$myObj
被设置为
null
或其他一些非对象值