Question

The title may be a bit confusing, so let me explain. I have a class and a method. That that method itself has a function. Like this:

class MyClass {
   public static function my_function($param) {
      function nested_function() {
        //do something with $param
      }
   }
}

So my question is, how can I access $param in nested_function?

EDIT

The reason I’m doing this is because of a wordpress thing. I need something like this:

class MyClass {
   public static function my_function($param) {
      function nested_function() {
        //do something with $param
      }

      add_action('init', 'nested_function');
   }
}

Answer 1

This is not a sensible thing to do. All named functions in PHP are global. Nesting them inside something else just makes their declaration conditional. I.e. you cannot call nested_function until you have called MyClass::my_function. And afterwards you cannot call MyClass::my_function again, because PHP will try to redeclare an existing function.

Maybe you want a closure, i.e. an anonymous function, which can include variables from the parent scope:

public static function my_function($param) {
    $nested_function = function () use ($param) {
        //do something with $param
    };
}