PHP: interface_exists - Manual

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Last updated: Sat, 27 Jan 2007

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# interface_exists

(PHP 5 >= 5.0.2)

interface_exists -- Checks if the interface has been defined

## Описание

bool interface_exists ( string interface_name [, bool autoload] )

Checks if the given interface has been defined.

## Список параметров

`interface_name`

  The interface name

`autoload`

  Wether to call __autoload or not by default

## Возвращаемые значения

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

## Примеры

Пример 1. interface_exists() example

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

## Смотрите также

class_exists()

add a note User Contributed Notes
interface_exists
andrey at php dot net
24-Oct-2004 04:40
`As far as I remember interface_exists() was added in 5.0.2 . In 5.0.0 and 5.0.1 class_exists() used to return TRUE when asked for a existing interface. Starting 5.0.2 class_exists() doesn't do that anymore.`
add a note
is_a get_parent_class

Last updated: Sat, 27 Jan 2007
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