W3cubDocs

/PHP

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

© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.interface-exists.php