Technical FAQ
PHP Manual
CSS2 Manual
HTML Manual
JS Guide
JS Reference
PhpDock Manual
Nu-Coder Manual
PhpExpress Manual
PHP Joomla
Learn PHP
Last updated: Tue, 19 Sep 2006


(PHP 5 >= 5.0.2)

interface_exists -- Checks if the interface has been defined


bool interface_exists ( string interface_name [, bool autoload] )

This function returns TRUE if the interface given by interface_name has been defined, FALSE otherwise.

Example 1. interface_exists() example

// Check the interface exists before trying to use it
if (interface_exists('MyInterface')) {
    class MyClass implements MyInterface
        // Methods


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

See also class_exists().

Last updated: Tue, 19 Sep 2006