gistfile1.php

<?php

define('WARRIOR_OFFSET', 16);
define('MAGE_OFFSET', 17);
define('CLASS_MASK', ( 1 << WARRIOR_OFFSET ) | ( 1 << MAGE_OFFSET ));

$bitmask = 1 << MAGE_OFFSET | 1 << WARRIOR_OFFSET;

$classMap = array(
        0b00 => 'error',
        0b01 => 'warrior',
        0b10 => 'mage',
        0b11 => 'seyan',
);

$class = $bitmask & CLASS_MASK;

$class = $class >> WARRIOR_OFFSET;

$class_name = $classMap[$class];

print "$class_name\n";