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property_exists (PHP 5 >= 5.1.0RC1) property_exists --
Checks if the object or class has a property
說明bool property_exists ( mixed class, string property )
This function checks if the given property exists in
the specified class (and if it was declared as public).
注:
As opposed with isset(),
property_exists() returns TRUE even if the property
has the value NULL.
參數
- class
A string with the class name or an object of the class to test for
- property
The name of the property
返回值
Returns TRUE if the property exists, FALSE if it doesn't exist or
NULL in case of an error.
範例
例子 1. A property_exists() example
<?php
class myClass { public $mine; private $xpto; }
var_dump(property_exists('myClass', 'mine')); //true var_dump(property_exists(new myClass, 'mine')); //true var_dump(property_exists('myClass', 'xpto')); //false, isn't public
?>
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