Use variable in static method inside nested function

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');
   }
}

function nested_function($param) use ($param) { // code here } — N.B.
– N.B., Commented Sep 12, 2012 at 13:06

deceze · Accepted Answer · 2012-09-12 13:15:03Z

4

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
    };
}

edited Sep 12, 2012 at 13:15

answered Sep 12, 2012 at 13:09

deceze♦

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4 Comments

tbleckert Over a year ago

Hi! Thank you, the reason why I'm doing this is because I'm doing a wordpress thing. And I need to use the add_action. I will update my question.

deceze Over a year ago

That seems like a terrible convention Wordpress has there which does not allow objects or anonymous functions as callback. You can try if class methods work, e.g. 'MyClass::some_callback', then you can pass the variable through a class property. Otherwise it seems only global can help you (shudder).

tbleckert Over a year ago

Well the anonymous function did actually work! Thank you! One question though, from what php version is this going to work?

deceze Over a year ago

Anonymous functions where introduced in PHP 5.3.

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