3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = function() { return function () { echo 'hi'; }; }; // works: $x()->__invoke(); $x()();
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
hi
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '(' in /in/GnAaO on line 5
Process exited with code 255.
preferences:
181.43 ms | 402 KiB | 198 Q