<?php function setPermission( $permissions, $type, $value) { if ($value) return $permissions | $type; else return $permissions & ~$type; } echo setPermission(2|4|16, 4|8, false) . "\n"; // 2|16 = 18 echo setPermission(2|4|16, 4|8, true ) . "\n"; // 2|4|8|16 = 30 echo setPermission(1|2|4, 4|8|16, false) . "\n"; // 1|2 = 3
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