$time php bubble.php real 0m30.911s user 0m28.362s sys 0m0.268s $time php bubble.php real 0m32.206s user 0m29.726s sys 0m0.208s $time php bubble.php real 0m30.047s user 0m28.366s sys 0m0.220s $time php bubble.php real 0m30.306s user 0m28.226s sys 0m0.248s $time php bubble.php real 0m29.819s user 0m28.258s sys 0m0.252s $time php bubble.php real 0m30.567s user 0m28.598s sys 0m0.244s $time php bubble.php real 0m30.386s user 0m28.322s sys 0m0.264s $