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class_exists
PHP Manual
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class_exists

(PHP 4, PHP 5)

class_exists -- Checks if the class has been defined

Description

bool class_exists ( string class_name [, bool autoload] )

This function checks if the given class have been defined.

Parameters

class_name

The class name

autoload

Whether to call __autoload or not by default

Return Values

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

ChangeLog

VersionDescription
5.0.0 The autoload was added.

Examples

Example 1. class_exists() example

<?php
// Check 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 if 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();
}

?>

See Also

interface_exists()
get_declared_classes()

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At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java 1.6, Tomcat 6.0.X, MySQL 5.0.x, Apache 2.2.xx and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.

 
 
 

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