Is there a way to reference a method name

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When using a framework, it's often the case that you can somehow reference a class name in a configuration - often you can also reference a method.

$setting = [
    'controller' => DemoController::class,
    'action'     => 'demoAction', // how to reference this?
];

A class is referenced by ::class. The big advantage comes when it comes to refactoring because a reference can be better refactored than a simple "string".

But if you want to apply the whole thing to methods, the question arises, how can you reference a method in such a way that the same possibility arises.

Is there already a corresponding approach or even a solution for this?

i.e. -> when using a "reference" for a class - and this class will be declared as "deprecated" then each usage of this class will be marked with a stroke:

enter image description here

The same behavior is missing wenn you only use a string. This is my point. the reference via string is no "real" reference.

RFC: https://wiki.php.net/rfc/function_referencing

phpstorm refactoring php
1 Answers

Yes, you can reference methods. Thanks to uniform variable syntax, a method call can be declared as array:

$func = [$this, 'functionname'];

Now it is bound to the current instance and can be called as

$func();

Note

Instead of passing new DemoController() you could pass an already created instance.

Example

Porting this to your code would end up in:

class DemoController {
    public function demoAction() {
        echo "Hello from DemoAction";
    }
}

$setting = [
    'controller' => DemoController::class,
    'action'     => [new DemoController(), 'demoAction'],
];

$setting['action']();

prints

Hello from DemoAction
Markus Zeller0
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