* Name: substring
* Purpose: Returns a substring of string. Same arguments as * PHP substr function. * @link based on substr(): http://www.zend.com/manual/function.substr.php * @author Mike Kerr * @param string * @param position: start position of substring (default=0, negative starts N from end) * @param length: length of substring (default=to end of string; negative=left N from end) * @return string */ function smarty_modifier_substring($string, $position = 0, $length = null) { if ($length == null) { return substr($string, $position); } else { return substr($string, $position, $length); } }