How to call function within function?

[sonuyos]

Alright, so i have setup a code in a module, in my whmcs.

 

I want to excute the main function again or a part of the function again

 

usually what i can do is

 

if(strpos($data, $word) !== false){
    changeips();
}

here changeips() is a function that i can call and it will go back to the top and run it again till the if is satisfied, but when i try to setup the code in module, like a function within function, it just doesnt run, it skips over, can anyone help me?
    

Example - This doesnt run.

function modulename_mycode($parms) {

XXX

XXX

XXX

XXX 

function changeips(){

YYY

YYY

YYY
$data = 'XXX';
$word = 'YYY';
if(strpos($data, $word) !==false){
  changeips();
}

}

However it just doesnt do anything, i trigger it in admin area, and i get no reply back.