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class_implements

(PHP 5, PHP 7, PHP 8)

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

Description

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 call __autoload by default.

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
)

See Also

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User Contributed Notes 4 notes

up
13
ludvig dot ericson at gmail dot nospam dot com
16 years ago
Hint:
<?php
in_array
("your-interface", class_implements($object_or_class_name));
?>
would check if 'your-interface' is ONE of the implemented interfaces.
Note that you can use something similar to be sure the class only implements that, (whyever you would want that?)
<?php
array("your-interface") == class_implements($object_or_class_name);
?>

I use the first technique to check if a module has the correct interface implemented, or else it throws an exception.
up
7
a dot panek at brainsware dot org
7 years ago
Calling class_implements with a non-loadable class name or a non-object results in a warning:

<?php
// Warning: class_implements(): Class abc does not exist and could not be loaded in /home/a.panek/Projects/sauce/lib/Sauce/functions.php on line 196

$interfaces = class_implements('abc');
?>

This is not documented and should just return FALSE as the documentation above says.
up
2
trollll23 at yahoo dot com
16 years ago
Luckily, it prints out superinterfaces as well in reverse order so iterative searching works fine:

    <?php
   
   
interface InterfaceA { }
   
    interface
InterfaceB extends InterfaceA { }
   
    class
MyClass implements InterfaceB { }
   
   
print_r(class_implements(new MyClass()));
   
   
?>

prints out:

    Array
    (
        [InterfaceB] => InterfaceB
        [InterfaceA] => InterfaceA
    )
up
-5
sam at rmcreative dot ru
2 years ago
The order of interfaces is not reliable and varies between PHP versions.
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