<?php
  function hexer($input){
    $answer ="";
    while ($input > 0) {

    $answer =  HEX($input % 16).$answer;
      $input =intval( $input / 16);
    }
    echo "it is ".$answer;
  }

  function HEX($input){
    switch ($input){
      case 10:
        return "A";
        break;
      case 11:
        return "B";
        break;
      case 12:
        return "C";
        break;
      case 13:
        return "D";
        break;
      case 14:
        return "E";
        break;
      case 15:
        return "F";
        break;
     default:
        return $input;
     }
  }


hexer(16);



?>