PHP forward_static_call vs call_user_func

Question

forward_static_call和之间有什么区别call_user_func

同样的问题适用于forward_static_call_array和call_user_func_array

Answer 1

所不同的仅仅是forward_static_call不重置,如果一个上升的类层次结构,并明确指定一个类的"类被称为"信息,而call_user_func(如果使用,但仍然不复位复位在这种情况下的信息parent,static或self).

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,forward_static_call如果沿着类层次结构拒绝转发:

<?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,forward_static_call只能从类方法中调用.