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(PHP 5 >= 5.0.2, PHP 7, PHP 8)

interface_existsVérifie si une interface a été définie


interface_exists(string $interface, bool $autoload = true): bool

Vérifie si une interface a été définie.

Liste de paramètres


Le nom de l'interface


Si l'on doit appeler __autoload ou non par défaut.

Valeurs de retour

Retourne true si l'interface fournie par le paramètre interface a été définie, false sinon.


Exemple #1 Exemple avec interface_exists()

// Vérifie si l'interface existe avant de l'utiliser
if (interface_exists('MyInterface')) {
MyClass implements MyInterface
// Méthodes


Voir aussi

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User Contributed Notes 4 notes

andrey at php dot net
18 years ago
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.
6 years ago
Class and Interface share SAME namespace!

class k{}

interface k {}    // Fatal error: Cannot redeclare class k
nils dot rocine at gmail dot com
11 years ago
A little note on namespaces that may be obvious to some, but was not obvious to me.

Although you can make the below statement when the statement is in the same namespace as the interface/class declaration MyInterface...
instanceof MyInterface

Making use of the interface_exists, or class_exists functions, you must enter the full namespaced interface name like so (even if the function call is from the same namespace.)
(__NAMESPACE__ . '\MyInterface', false);
maxim at inbox dot ru
10 years ago
If you want to check for included interface and you already register spl autoloader - it will crash. Becassue autoloader trying to load `string` and he doesnt matter is it class or not.
Iv found several ways :
1 - unregister AL - -> check for Ifaces - -> register Autoloader

2 - $ifaces = array_flip(get_declared_interfaces());
if($ifaces["MyIface"]) // empty // isset .

Interfaces are not bad, you can build correct geomentry of system , with validation by funcs / vars / const .
Also they are good to storage variables <?php
::THEMES ; ROOT::LOC ; ?> . Much faster then Define, but you cant put algorithms inside, only complite strings / __file__ / etc.
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