3v4l.org

run code in 300+ PHP versions simultaneously
<?php $hashes = array(); $collisions = 0; for($i=0; $i < 6000; $i++){ $hash = hash("crc32", $i); if (in_array($hash, $hashes)) { $collisions++; } else { array_push($hashes, $hash); } } echo $collisions; ?>
Output for 5.1.2 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
0
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.1
Fatal error: Call to undefined function hash() in /in/goPXU on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: hash() in /in/goPXU on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: hash() in /in/goPXU on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: hash() in /in/goPXU on line 7

preferences:
248.47 ms | 401 KiB | 455 Q