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# interface_exists

(no version information, might be only in CVS)

interface_exists -- Checks if the interface has been defined

## Description

bool interface_exists ( string interface_name [, bool autoload] )

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

範例 1. interface_exists() example

`<?php // 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().

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