<?php
class Utilities {

  function showFunctions() {
    $cur_functions = debug_backtrace();
    foreach ($cur_functions as $this_function) {
      $content .= "<br>";
      $content .= $this_function["function"];
    }
    echo $content;
  }

  function boolZeroProtect($return_str) {
    if ($return_str=="0")
      return "zero";
    elseif ($return_str=="")
      return "null";
    else
      return $return_str;
  }

  function boolZeroRelease($returned_str) {
    if ($returned_str=="zero")
      return "0";
    elseif ($returned_str=="null")
      return "";
    else
      return $returned_str;
  }

}
?>