Solution to " Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, non-static method app\controllers\SiteController::contact() cannot be called statically" error during the implementation of the controller

[araragi-koyomi-sama]

hello, i'm using php 8.x, i solved this problem making static every function in SiteController (where i had to use SiteController), based on the documentation in the version 8.x the operator :: is used for static functions, i also had to use use app\core\Application in the SiteController to include Application in SiteController. I write down this here just in the case other one had the same problem. (sorry for my english, I'm not a native speaker)

[araragi-koyomi-sama]

also, if someone find a solution to this kind of problems whitout making the functions statics I'm looking forward to heard about it

[onabright]

Hi guys, I am also using PHP 8.x and I had to declare my functions as static to resolve the error: Uncaught TypeError: call_user_func(). Hopefully I will figure out how to do it without using static methods.

[mahmoodhussam]

I think to solve this problem , when you used call_user_fun without made object from the class, you could use only static function but when you used object from this class you could use pure functions

[karam-mustafa]

you can solve problem by make new instance from this class, like this

$app->router->get('/about', [AboutController::class, 'index']); // from this

$app->router->get('/about', [new AboutController(), 'index']); // to this

[AlanSMat]

Thank you @karam-mustafa, that worked for me.

[eisa97]

you can solve problem by make new instance from this class, like this

$app->router->get('/about', [AboutController::class, 'index']); // from this

$app->router->get('/about', [new AboutController(), 'index']); // to this

hi
thank you; but how can i use $app->router->get('/about', [AboutController::class, 'index']) exactly, because this is used on a tutorial movie. but do not work for me.

[none-08]

you can solve problem by make new instance from this class, like this

$app->router->get('/about', [AboutController::class, 'index']); // from this

$app->router->get('/about', [new AboutController(), 'index']); // to this

Thanks a lot, i was trying to solve this for quite a while and i was about to give up

[Mouhamed120]

[::1]:62171 [500]: GET /products/create - Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, non-static method app\controllers\ProductController::create() cannot be called statically in C:\xampp\htdocs\learn_php\01_theholicod\15-autoloading\better\Router.php:35
Stack trace:
#0 C:\xampp\htdocs\learn_php\01_theholicod\15-autoloading\better\Router.php(35): call_user_func()
#1 C:\xampp\htdocs\learn_php\01_theholicod\15-autoloading\better\public\index.php(19): app\Router->resolve()
#2 {main}
thrown in C:\xampp\htdocs\learn_php\01_theholicod\15-autoloading\better\Router.php on line 35
Help

[Mouhamed120]

I think the problem is solved but I have not tested

$app->router->get('/about', [AboutController::class, 'index']); // from this

$app->router->get('/about', [new AboutController(), 'index']); // to this

[MohammadRezaeeGithub]

I use php 8.* as well and I had the same problem. because I liked the way we write our route , I changed my resolve method in Router class.

I called the function like this:
return call_user_func([new $callback[0],$callback[1]]);

[imManish]

you can solve this by checking if your callback is_array or string

return call_user_func($this->isCheck($callback));

/**
 * @param $callback
 * @return mixed
 */
private function isCheck($callback)
{
    if(is_array($callback))
        $callback[0] = new $callback[0];

    return $callback;
}