Why and how do you use anonymous functions in PHP?

Question

Anonymous functions are available from PHP 5.3.
Should I use them or avoid them? If so, how?

Edited; just found some nice trick with php anonymo

Answer 1

Here is sample example of using using anonymous functions in Php

$suppliers=['add1'=>'nodia','add2'=>'delhi', 'add3'=>'UP'];
 $getAddress = function($suppliers){ $address=[];
 for($i=1;$i<5;$i++){
  if(array_key_exists('add'.$i, $suppliers))
    $address[]=$suppliers['add'.$i];
  }
 return $address;};
 print_r($getAddress($suppliers));

In above example we have written anonymous functions that check if a key exists in inputted array. If it exists then it will put that into output array.