Here’s a nice function to check if a string ends with another string:

  function endsWith($haystack,$needle,$case=true) {
    if($case){
      return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);
    }
    return (strcmp(strtolower(substr($haystack, strlen($haystack) - strlen($needle))),strtolower($needle))===0);
  }