3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = function() { return function () { echo strtoupper('hi ho'),"\n"; }; }; // works: $x()->__invoke(); // works in PHP7: $x()();
Output for 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
HI HO HI HO
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '(' in /in/0P74i on line 8
Process exited with code 255.

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225.07 ms | 401 KiB | 326 Q