# interface_exists

(PHP 5 >= 5.0.2, PHP 7)

interface_exists — Checks if the interface has been defined

### Description

interface_exists ( string `$interface_name` [, bool `$autoload` = `TRUE` ] ) : bool

Checks if the given interface has been defined.

### Parameters

`interface_name`

  The interface name

`autoload`

  Whether to call __autoload or not by default.

### Return Values

Returns `TRUE` if the interface given by `interface_name` has been defined, `FALSE` otherwise.

### Examples

Example #1 interface_exists() example

`<?php
// Check the interface exists before trying to use it
if (interface_exists('MyInterface')) {
class MyClass implements MyInterface
{
// Methods
}
}
?>`

### See Also

- get_declared_interfaces() - Returns an array of all declared interfaces
- class_implements() - Return the interfaces which are implemented by the given class or interface
- class_exists() - Checks if the class has been defined