use call_user_func in PHP 8 returns fatal error

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I am trying to call a class named ContactController with the function handleContact with call_user_func([ContactController::class, 'handleContact']); but got following error:

Fatal error: Uncaught Error: Non-static method app\controllers\ContactController::handleContact() cannot be called statically

<?php
namespace app\controllers;

class ContactController {
    public function handleContact() {
        return 'Hello World';
    }
}
php-8 php
2 Answers

If the method handleContact is static than call it:

call_user_func([ContactController::class, 'handleContact'])

If your method handleContact is not static than you need to pass an instantiated class e.g.

$contactController = new ContactController();
call_user_func([$contactController, 'handleContact'])

P.S. Setting the handleContact to static would be the easy way out.

Admin1

As handleContact is not a static method, you should instantiate your ContactController first and then call the function on the created instance.

You don't even need to use the ugly call_user_func() in modern PHP, as you can invoke the callback directly by ().

  $controller = new ContactController();
  [$controller, 'handleContact']();

If however your handleContact method doesn't directly operate on ContactController instance (i.e. doesn't use $this variable), you can convert your method to static by using the static keyword in method definition and your original code should work.

user_149674130
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