--- BIT SHIFT RIGHT ON POSITIVE INTEGERS ---
"; $val = 4; $places = 1; $res = $val >> $places; p($res, $val, '>>', $places); $places += $aggregate[0]; $res = $val >> $places; p($res, $val, '>>', $places); $places += $aggregate[1]; $res = $val >> $places; p($res, $val, '>>', $places); $places == $aggregate[2]; $res = $val >> $places; p($res, $val, '>>', $places); echo "
--- BIT SHIFT RIGHT ON NEGATIVE INTEGERS ---
"; $val = -4; $places = 1; $res = $val >> $places; p($res, $val, '>>', $places); $places += $aggregate[3]; $res = $val >> $places; p($res, $val, '>>', $places); $places += $aggregate[4]; $res = $val >> $places; p($res, $val, '>>', $places); echo "
--- BIT SHIFT LEFT ON POSITIVE INTEGERS ---
"; $val = 4; $places = 1; $res = $val << $places; p($res, $val, '<<', $places); $places = (PHP_INT_SIZE * 8) - $aggregate[5]; $res = $val << $places; p($res, $val, '<<', $places); $places = (PHP_INT_SIZE * 8) - $aggregate[6]; $res = $val << $places; p($res, $val, '<<', $places); $places = (PHP_INT_SIZE * 8) - $aggregate[7]; $res = $val << $places; p($res, $val, '<<', $places); echo "
--- BIT SHIFT LEFT ON NEGATIVE INTEGERS ---
"; $val = -4; $places = 1; $res = $val << $places; p($res, $val, '<<', $places); $places = (PHP_INT_SIZE * 8) - $aggregate[8]; $res = $val << $places; p($res, $val, '<<', $places); $places = (PHP_INT_SIZE * 8) - $aggregate[9]; $res = $val << $places; p($res, $val, '<<', $places); function p($res, $val, $op, $places) { $format = '%0'.(PHP_INT_SIZE * 8)."b
"; printf("Expression: %d = %d %s %d
", $res, $val, $op, $places); echo " Decimal:
"; printf(" val = %d
", $val); printf(" res = %d
", $res); echo " Binary:
"; printf(' val = '.$format, $val); printf(' res = '.$format, $res); } ?>

Bit shifting [PHP]