3v4l.org

run code in 300+ PHP versions simultaneously
<?php $hashes = array(); $collisions = 0; for($i=0; $i < 60000; $i++){ $hash = hash("crc32", $i); if (in_array($hash, $hashes)) { $collisions++; } else { array_push($hashes, $hash); } } echo $collisions; ?>
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6

Process exited with code 137.
preferences:
159.74 ms | 404 KiB | 228 Q