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.
class_implements
(PHP 5, PHP 7)
class_implements — Return the interfaces which are implemented by the given class or interface
Descrierea
This function returns an array with the names of the interfaces that the
given class and its parents implement.
Parametri
-
class -
An object (class instance) or a string (class or interface name).
-
autoload -
Whether to allow this function to load the class automatically through the __autoload() magic method.
Valorile întoarse
An array on success, or false on error.
Exemple
Example #1 class_implements() example
<?php
interface foo { }
class bar implements foo {}
print_r(class_implements(new bar));
// since PHP 5.1.0 you may also specify the parameter as a string
print_r(class_implements('bar'));
function __autoload($class_name) {
require_once $class_name . '.php';
}
// use __autoload to load the 'not_loaded' class
print_r(class_implements('not_loaded', true));
?>
Exemplul de mai sus va afișa ceva similar cu:
Array
(
[foo] => foo
)
Array
(
[interface_of_not_loaded] => interface_of_not_loaded
)
A se vedea și
- class_parents() - Return the parent classes of the given class
- get_declared_interfaces() - Returns an array of all declared interfaces
add a note
User Contributed Notes 4 notes
ludvig dot ericson at gmail dot nospam dot com ¶
19 years ago
a dot panek at brainsware dot org ¶
11 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.
trollll23 at yahoo dot com ¶
19 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
)
sam at rmcreative dot ru ¶
5 years ago
The order of interfaces is not reliable and varies between PHP versions.
