3v4l.org

run code in 300+ PHP versions simultaneously

sponsor
bughunt
search
recent
about

@ 2025-12-18T13:09:39Z

<?php

function isQuadtree($bits, &$i = 0){
 if ($i >= str_length($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("110000"));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

25.14 ms | 404 KiB | 5 Q