PHP forward_static_call与call_user_func [英] PHP forward_static_call vs call_user_func

问题描述

forward_static_call和call_user_func

同样的问题也适用于forward_static_call_array和call_user_func_array

And the same question applies to forward_static_call_array and call_user_func_array

推荐答案

区别仅在于，如果上层类层次结构并显式命名一个类，则forward_static_call不会重置被叫类"信息，而call_user_func在这种情况下会重置信息(但如果使用parent，static或self仍不会重置信息).

The difference is just that forward_static_call does not reset the "called class" information if going up the class hierarchy and explicitly naming a class, whereas call_user_func resets the information in those circumstances (but still does not reset it if using parent, static or self).

示例:

<?php
class A {
    static function bar() { echo get_called_class(), "\n"; }
}
class B extends A {
    static function foo() {
        parent::bar(); //forwards static info, 'B'
        call_user_func('parent::bar'); //forwarding, 'B'
        call_user_func('static::bar'); //forwarding, 'B'
        call_user_func('A::bar'); //non-forwarding, 'A'
        forward_static_call('parent::bar'); //forwarding, 'B'
        forward_static_call('A::bar'); //forwarding, 'B'
    }
}
B::foo();

请注意，如果>向下移动类层次结构，则拒绝转发:

Note that forward_static_call refuses to forward if going down the class hierarchy:

<?php
class A {
    static function foo() {
        forward_static_call('B::bar'); //non-forwarding, 'B'
    }
}
class B extends A {
    static function bar() { echo get_called_class(), "\n"; }
}
A::foo();

最后，请注意，只能在类方法中调用forward_static_call.

Finally, note that forward_static_call can only be called from within a class method.

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