call_user_func_array does not execute __callStatic magic method

Question

I have these two classes:

class Service {
    public static function __callStatic($name, $arguments)
    {
        // ... opt-out code
        $result = call_user_func_array([CacheService::class, $name], $arguments);
        // ... opt-out code
    }
}

And this

class CacheService
{
    public static function __callStatic($name, $arguments)
    {
        // ... opt-out code
        if (self::getCacheInstance()->has('some_cache_key')) {
            return call_user_func_array(['self', $name], $arguments);
        }
        // ... opt-out code
    }

    public static function getItems()
    {
        //... do operations
    }
}

When I call Service::getItems(); from the controller, it executes __callStatic in Service class, but when Service class attempts to call getItems() from CacheService, it does not execute __callStatic in CacheService class. What is the problem exactly ?

Marvin Fischer · Accepted Answer · 2018-08-25 14:35:31Z

2

__callStatic is only executed when there is no static method with the calling method name

Your Service class does not contain a getItems() method so __callStatic gets executed.

Your CacheService does contain it so getItems gets executed instead

http://php.net/manual/en/language.oop5.overloading.php#object.callstatic

Example:

<?php

class A {
    public static function __callStatic() {
        echo "A::__callStatic";
    }
}

class B {
    public static function __callStatic() {
        echo "B::__callStatic";
    }

    public static function getItems() {
        echo "B::getItems";
    }
}

A::getItems(); // A::__callStatic
B::getItems(); // B::getItems()
B::anotherFunction(); // B::__callStatic

edited Aug 25, 2018 at 14:35

answered Aug 24, 2018 at 13:11

Marvin Fischer

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