property_exists

Checks if the object or class has a property (PHP 5 >= 5.1.0RC1)
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).

注意:

As opposed with isset(), property_exists() returns TRUE even if the property has the value NULL.

参数

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.

范例

例 355. A property_exists() example

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<?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

?>
参见
method_exists()