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run code in 300+ PHP versions simultaneously
<?php declare(strict_types=1); $fixers = ['foo', 'bar']; var_dump("The provided fixer '$fixers[0]' cannot be enabled at the same time as '$fixers[1]'.");
Output for 7.0.0 - 7.0.20, 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
string(69) "The provided fixer 'foo' cannot be enabled at the same time as 'bar'."
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Warning: Unsupported declare 'strict_types' in /in/eEkfS on line 1 string(69) "The provided fixer 'foo' cannot be enabled at the same time as 'bar'."

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165.62 ms | 402 KiB | 224 Q