PHP Manual: Checks if the object or class has a property

Description

bool property_exists ( mixed $class , string $property )

This function checks if the given property exists in the specified class.

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

Parameters

class: The class name or an object of the class to test for
property: The name of the property

Return Values

Returns TRUE if the property exists, FALSE if it doesn't exist or NULL in case of an error.

Notes

Note:
Using this function will use any registered autoloaders if the class is not already known.

Note:
The property_exists function cannot detect properties that are magically accessible using the __get magic method.

Changelog

Version	Description
5.3.0	This function checks the existence of a property independent of accessibility.

Examples

Example #1 A property_exists example


<?php

class myClass {
    public $mine;
    private $xpto;
    static protected $test;

    static function test() {
        var_dump(property_exists('myClass', 'xpto')); //true
    }
}

var_dump(property_exists('myClass', 'mine'));   //true
var_dump(property_exists(new myClass, 'mine')); //true
var_dump(property_exists('myClass', 'xpto'));   //true, as of PHP 5.3.0
var_dump(property_exists('myClass', 'bar'));    //false
var_dump(property_exists('myClass', 'test'));   //true, as of PHP 5.3.0
myClass::test();

?>

property_exists