Rechercher une fonction PHP

class_exists

Contents

(PHP 4, PHP 5, PHP 7)

class_exists — Checks if the class has been defined

Description

class_exists ( string $class_name [, bool $autoload = TRUE ] ) : bool

This function checks whether or not the given class has been defined.

PHP: class_exists - Manual Home of Manuel PHP  Contents Haut

Parameters

class_name

The class name. The name is matched in a case-insensitive manner.

autoload

Whether or not to call __autoload by default.

PHP: class_exists - Manual Home of Manuel PHP  Contents Haut

Return Values

Returns TRUE if class_name is a defined class, FALSE otherwise.

PHP: class_exists - Manual Home of Manuel PHP  Contents Haut

Changelog

Version Description
5.0.2 No longer returns TRUE for defined interfaces. Use interface_exists().

PHP: class_exists - Manual Home of Manuel PHP  Contents Haut

Examples

Example #1 class_exists() example

<?php
// Check that the class exists before trying to use it
if (class_exists('MyClass')) {
    $myclass = new MyClass();
}

?>

Example #2 autoload parameter example

<?php
function __autoload($class)
{
    include($class . '.php');

    // Check to see whether the include declared the class
    if (!class_exists($class, false)) {
        trigger_error("Unable to load class: $class", E_USER_WARNING);
    }
}

if (class_exists('MyClass')) {
    $myclass = new MyClass();
}

?>

PHP: class_exists - Manual Home of Manuel PHP  Contents Haut

See Also

Find a PHP function

English translation

You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.

If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.

Thank you in advance.

Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-function.class-exists.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut