Using current variable function inside the function

Question

i need to recursively call a variable function, how can i do this?

$rec = function($li) use($html,$rec) { // error, rec was not defined yet
   if( ... ) $rec( ... ); 
}

how can i do this?

Answer 1

Use the function variable $rec by reference (&$rec) so you can set it to the function then. This will also define it.

use($html, &$rec) 
           ^

You find this principle outlined in the question Anonymous recursive PHP functions.