class_implements

(PHP 5, PHP 7, PHP 8)

class_implements Retorna as interfaces que são implementadas pela classe

Descrição

class_implements ( mixed $class , bool $autoload = ? ) : array

Esta função retorna um array com os nomes das interfaces que a classe class e seus pais implementam.

Parâmetros

class

Um objeto (instância da classe) ou uma string (nome da classe).

autoload

Permitir ou não que essa função carregue a classe automaticamente pelo método mágico __autoload O padrão é true.

Valor Retornado

Um array em sucesso, ou false em caso de erro.

Changelog

Versão Descrição
5.1.0 Adicionada a opção de passar o parâmetro class como uma string. Adicionado o parâmetro autoload.

Exemplos

Exemplo #1 Exemplo de class_implements()

<?php

interface foo { }
class 
bar implements foo {}

print_r(class_implements(new bar));

// desde o PHP 5.1.0 você também pode especificar o parâmetro como uma string
print_r(class_implements('bar'));


function 
__autoload($class_name) {
   require_once 
$class_name '.php';
}

// utiliza o __autoload para carregar a classe 'not_loaded'
print_r(class_implements('not_loaded'true));

?>

O exemplo acima irá imprimir algo similar à:

Array
(
    [foo] => foo
)

Array
(
    [interface_of_not_loaded] => interface_of_not_loaded
)

Veja Também

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User Contributed Notes 5 notes

up
48
paul at paulferrett dot com
14 years ago
You can also check if a class implements an interface using instanceof.

E.g.
<?php
if($myObj instanceof MyInterface) {
    echo
"It is! It is!";
}
?>
up
13
ludvig dot ericson at gmail dot nospam dot com
18 years ago
Hint:
<?php
in_array
("your-interface", class_implements($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
6
a dot panek at brainsware dot org
10 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
18 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
-2
sam at rmcreative dot ru
5 years ago
The order of interfaces is not reliable and varies between PHP versions.
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