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run code in 300+ PHP versions simultaneously
<?php class Foo { } for ($i = 0; $i < 10000000; $i++) $a = new Foo();
Output for 5.3.1 - 5.3.3, 5.3.5, 5.3.7 - 5.3.13, 5.3.15 - 5.3.29, 5.4.0 - 5.4.45, 5.6.28, 7.0.12 - 7.0.14, 7.1.0, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 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
Output for 5.3.0, 5.3.4, 5.3.6, 5.3.14

Process exited with code 137.
preferences:
156.83 ms | 401 KiB | 219 Q