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run code in 300+ PHP versions simultaneously
<?php namespace Foo; while (true){ static $panda = 1; $panda++; }
Output for 5.3.3 - 5.3.22, 5.4.0 - 5.4.12, 7.0.20, 7.1.5 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 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:
132.02 ms | 404 KiB | 182 Q