Manual de PHP
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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])

Nota: The autoload parameter was added in PHP 5

This function returns TRUE if the class given by class_name has been defined, FALSE otherwise.

class_exists() will attempt to call __autoload by default, if you don't want class_exists() to call __autoload(), you can set the parameter autoload to FALSE.

Ejemplo 1. autoload parameter example

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

        /* Check to see it the include defined the class */
        if ( !class_exists($class, false) ) {
           trigger_error("Unable to load class $class", E_USER_ERROR);
        }
    }
    
    if( class_exists('MyClass') ) {
        $myclass = new MyClass();
    }

?>

See also get_declared_classes().

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