3v4l.org

run code in 300+ PHP versions simultaneously
<?php function isQuadtree($bits, &$i = -1){ $i++; if ($i >= strlen($bits)) return false; if ($bits[$i] === "1") { isQuadtree($bits, $i); isQuadtree($bits, $i); isQuadtree($bits, $i); return isQuadtree($bits, $i); } return true; } var_dump(isQuadtree("110000000"));
Output for git.master_jit, git.master
bool(true)

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

preferences:
30.85 ms | 405 KiB | 5 Q