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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 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 add a note

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Last updated: Sat, 27 Jan 2007
 
 
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