class_implements()

(PHP 5, PHP 7)

返回指定的类实现的所有接口。

说明

本函数返回一个数组，该数组中包含了指定类$class及其父类所实现的所有接口的名称。

参数

对象（类实例）或字符串（类名称）。

是否允许使用__autoload魔术函数来自动装载该类。默认值为TRUE。

返回值

调用成功则返回一个数组，否则返回FALSE。

更新日志

范例

class_implements() example

以上例程的输出类似于：

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

参见

• class_parents()返回指定类的父类。
• get_declared_interfaces()返回一个数组包含所有已声明的接口

You can also check if a class implements an interface using instanceof.
E.g. 

Hint:

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?)

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:

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:
  
prints out:
  Array
  (
    [InterfaceB] => InterfaceB
    [InterfaceA] => InterfaceA
  )

The order of interfaces is not reliable and varies between PHP versions.

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