- var_dump: documentation ( source)
- define: documentation ( source)
<?php
define('FLAG_1', 1 << 0);
define('FLAG_2', 1 << 1);
define('FLAG_3', 1 << 2);
define('FLAG_4', 1 << 3);
define('FLAG_5', 1 << 4);
define('FLAG_6', 1 << 5);
define('FLAG_7', 1 << 6);
define('FLAG_8', 1 << 7);
define('FLAG_9', 1 << 8);
var_dump(FLAG_9);