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PHP

Checks if the class has been defined


class_exists

(PHP 4, PHP 5)

class_existsChecks if the class has been defined

Description

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

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

Parameters

class_name

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

autoload

Whether or not to call __autoload by default.

Return Values

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

Changelog

Version Description
5.0.2 No longer returns TRUE for defined interfaces. Use interface_exists().
5.0.0 The autoload parameter was added.

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($classfalse)) {
        
trigger_error("Unable to load class: $class"E_USER_WARNING);
    }
}

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

?>

See Also



Content

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

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