如何在PHP4中检查PHP对象是否具有属性。

Question

我想检查一个PHP对象是否有某个属性。对于PHP5，我可以使用

if (property_exists($object, "foo")) {...}

但我应该如何在PHP4中实现同样的功能？

- Alex

Answer 1

你可以使用get_object_vars函数并检查返回的数组是否存在你要查找的属性。

请参考此处关于get_object_vars的文档: http://php.net/manual/en/function.get-object-vars.php

- vee

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同样的方式：$obj_arr = (array)$object; print isset($obj_arr["foo"]); - gaborous

Answer 2

/***
Just as you would do for PHP5, you can apply the same concept for PHP 4. 

***/
//$data is a JSON object am receiving from a  server.
$data = json_decode(stripslashes($_REQUEST['data']));

/****
Applying the same property_exists method but remember to keep both object/class    
and the property to check for in single quotes.
*****/
if (property_exists('data', 'content')) 
{

$content = $data->content;
}

- user3614533

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