gistfile1.php

<?php
//** Give this user access to kListOne and kListTwo
$iUser1 = kNew; // sets to 1
$iUser1 |= kListOne; // sets to 3
$iUser1 |= kListTwo; // sets to 7

//** Give this user access to kListTwo and k3rdPartyOptIn
$iUser2 = kNew; //sets to 1
$iUser2 |= kListTwo; //sets to 5
$iUser2 |= k3rdPartyOptIn; //sets to 13

//** TESTS
echo( $iUser1 & kListOne ) ? 'yes' : 'no'; //outputs 'yes'
echo( $iUser1 & kListTwo ) ? 'yes' : 'no'; //outputs 'yes'
echo( $iUser2 & kListOne ) ? 'yes' : 'no'; //outputs 'no'