I have an issue I know how to solve but I am curios to why I need to make this extra step to make it work.

I have the following code:

foreach ($routes as $key => $value) {
    $router->$value["method"]($value["path"], "something");
}

the value inside the array $value["method"] is a string that maps to the method names on the class Router

If I run this code I get the error:
Warning: Array to string conversion

If I change the code to the following, it works:

foreach ($routes as $key => $value) {
    $method = $value["method"];
    $router->$method($value["path"], "something");
}

The solution is to extract the value from the array before using it as a variable method. It seems that the PHP interpreter doesn't retrieve the value from the array when it's used directly within a variable method, resulting in an 'array to string' error. Extracting the value first resolves this issue.

anyone could clarify?

Example: https://3v4l.org/RmAXf

It is clearly documented - I guess I just never paid close enough attention before: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax

But I am wondering if anybody knows why? Was this an intentional decision?