Check if checkbox should be checked based on GET value

gistfile1.php

<?php
/*
*  Check if checkbox should be checked based on GET value
*/
function isChecked($chkname,$value) {
      if(!empty($_GET[$chkname])){
          foreach($_GET[$chkname] as $chkval){
              if($chkval == $value){
                  return true;
              }
          }
      }
      return false;
  }