CODEWITHSUNDEEP
phpclassscope
Eathen Nutt
Eathen Nutt

Reputation: 1473

PHP Class Scope confusing with call_user_func()

class A
{
    public static function who1()
    {
        var_dump(get_called_class());
    }
}
class B extends A
{
    public static function who2()
    {
        parent::who1();
    }
}
call_user_func(array('B', 'parent::who1'));
B::who2();

What I expect:

string 'B' (length=1)

string 'B' (length=1)

Actual returns:

boolean false

string 'B' (length=1)

Can anyone tell me why the output is different from what I expected?

see also:

https://www.php.net/manual/en/language.types.callable.php

https://www.php.net/manual/en/function.get-called-class.php

edit: Maybe my old code is not clear, here is the new example:

class A
{
    public static function who()
    {
        var_dump(get_called_class());
    }
}
class B extends A
{
    public static function who()
    {
        echo 'hehe';
    }
}
call_user_func(array('B', 'parent::who'));

why it output false?

Upvotes: 2

Views: 892

Answers (1)

BlitZ
BlitZ

Reputation: 12168

From the PHP manual documentation for Object Inheritance:

For example, when you extend a class, the subclass inherits all of the public and protected methods from the parent class. Unless a class overrides those methods, they will retain their original functionality.

As stated above, there is no need of parent prefix there in call_user_func():

call_user_func(array('B', 'who'));

You got FALSE in var_dump() because call_user_func() stated method call outside a class. So get_called_class() behaved as expected (or mentioned in the manual):

Returns FALSE if called from outside a class.

Upvotes: 2

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