Correct my syntax?

[hyperj123]

Haven't coded in php in a while and I'm now drawing blanks. Could someone simply correct my syntax on this?

<?php 
session_start(); 

if $_SESSION['user_name'] == 'john', 'mike';
include ("audit_live.html"); 
else 
include ("audit.html");

?>

[pritaeas]

if ($_SESSION['user_name'] == 'john') or $_SESSION['user_name'] == 'mike')

or

if (in_array($_SESSION['user_name'], array ('john', 'mike')))

http://php.net/manual/en/language.control-structures.php

[hyperj123]

thank you!