note 15953 added to language.operators.bitwise

All shifts are signed shifts. The shift is performed with the shift count modulo 32, which explains the behavior which looks like a bit rotation, mentioned above. Example: $bit = 0x20000000; print "$bit << 5 == " . ($bit << 5) . $prod . "<br />"; print "$bit >> 5 == " . ($bit >> 5) . $prod . "<br />"; print "$bit >> 37 == " . ($bit >> 37) . $prod . "<br />"; $bit = 4; print "$bit >> 5 == " . ($bit >> 5) . $prod . "<br />"; print "$bit << 5 == " . ($bit << 5) . $prod . "<br />"; print "$bit << 37 == " . ($bit << 37) . $prod . "<br />"; Results: 536870912 << 5 == 0 536870912 >> 5 == 16777216 536870912 >> 37 == 16777216 4 >> 5 == 0 4 << 5 == 128 4 << 37 == 128 -- http://www.php.net/manual/en/language.operators.bitwise.php http://master.php.net/manage/user-notes.php?action=edit+15953 http://master.php.net/manage/user-notes.php?action=delete+15953 http://master.php.net/manage/user-notes.php?action=reject+15953