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SPL Functions	class_parents

SPL Functions	Last updated: Mon, 26 Oct 2026

class_implements

(PHP 5, PHP 7, PHP 8)

class_implements — Return the interfaces which are implemented by the given class or interface

Description

function class_implements(object|string $object_or_class, bool $autoload = true): array|false

This function returns an array with the names of the interfaces that the given object_or_class and its parents implement.

Parameters

object_or_class: An object (class instance) or a string (class or interface name).
autoload: Whether to autoload if not already loaded.

Return Values

An array on success, or false when the given class doesn't exist.

Examples

Example #1 class_implements() example

<?php

interface foo { }
class bar implements foo {}

print_r(class_implements(new bar));

// you may also specify the parameter as a string
print_r(class_implements('bar'));

spl_autoload_register();

// use autoloading to load the 'not_loaded' class
print_r(class_implements('not_loaded', true));

?>

The above example will output something similar to:

Array
(
    [foo] => foo
)
Array
(
    [foo] => foo
)
Array
(
    [interface_of_not_loaded] => interface_of_not_loaded
)

Notes

Note:
To check that an object implements an interface, instanceof or the is_a() function should be used instead.

See Also

class_parents() - Return the parent classes of the given class
get_declared_interfaces() - Returns an array of all declared interfaces
is_a() - Checks whether the object is of a given type or subtype
instanceof

SPL Functions	class_parents

SPL Functions	Last updated: Mon, 26 Oct 2026