Smarty variable modifier to split a string

/*
* Name: split_list_third
* Purpose: Split string at specified pattern and return third half
* Example: {$var|split_list_second:"@"} *
* @version 1.0
* @param string
* @param string
* @return string
*/
function smarty_modifier_split_list_third($string,$pattern)
{
list($part1,$part2,$part3) = split("$pattern",$string);
return $part3;
}
?>

Example:
In php lets assign a string variable
$smarty->assign('phone', '91,040,23451231');
?>

In the Template
{$phone|split_list_third:","}

This will output:
23451231

Above modifier can also be modified to Split a string at specified pattern and return second half

Thanks,
Indrani