3v4l.org

run code in 300+ PHP versions simultaneously
<?php $i = 5; while ($i > 0): $power = 1; $bin = array(); if ($i / pow(2,$power) != 0) { $bin[$power - 1] = 1; $i = $i - pow(2,$power-1); } else { $bin[$power - 1] = 0; } print $bin[$power - 1]; $power++; endwhile; ?>

preferences:
33.6 ms | 402 KiB | 5 Q