如何在PHP4中检查PHP对象是否具有属性。

Question

我想检查一个PHP对象是否有属性。对于PHP5，我可以使用

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

但是我怎么能在PHP4中做同样的事情呢？

Answer 1

如果您的属性存在，您可以使用get_object_vars并检查生成的数组。

请参阅get_object_vars此处的文档：http://php.net/manual/en/function.get-object-vars.php

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;
}