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Rechercher une fonction PHP

class_exists

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(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.

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Parameters

class_name

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

autoload

Whether or not to call __autoload by default.

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Return Values

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

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Changelog

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

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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();
}

?>

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See Also

Find a PHP function

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Document created the 30/01/2003, last modified the 26/10/2018
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References

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

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