(PHP 5, PHP 7, PHP 8)
class_implements — 返回指定的类或接口实现的所有接口
本函数返回数组，包含指定 object_or_class 及其父类所实现的所有接口的名称。
成功时为数组，当指定类不存在则为 false。
示例 #1 class_implements() 示例
<?php
interface foo { }
class bar implements foo {}
print_r(class_implements(new bar));
// 可以指定参数为字符串
print_r(class_implements('bar'));
spl_autoload_register();
// 使用自动加载去加载“not_loaded”类
print_r(class_implements('not_loaded', true));
?>以上示例的输出类似于：
Array
(
[foo] => foo
)
Array
(
[foo] => foo
)
Array
(
[interface_of_not_loaded] => interface_of_not_loaded
)
注意: 检测对象是否 implements interface，应该使用
instanceof或 is_a() 函数。
instanceofHint:
<?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.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.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
)