3v4l.org

run code in 300+ PHP versions simultaneously
<?php function show($v) { echo "$v\n"; } for($i = 0; $i < 1000; $i++) { if (pow(2, $i) !== 1 << $i) { var_dump($i); break; } }

preferences:
39.72 ms | 405 KiB | 6 Q