How to get Max ID row from mysql table using php

Do you need to find the max id of a mysql table? check out the following code.
simply use the sql MAX function to find the max id.

<?php

mysql_connect("localhost","root","");
mysql_select_db(test);

$q = "select MAX(id) from tbl_name";
$result = mysql_query($q);
$data = mysql_fetch_array($result);

echo $data[0];

?>