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run code in 300+ PHP versions simultaneously
<?php $a="a-zA-Z0-9.-_~!$&'()*+,;=:@"; echo $a; echo PHO_EOL; echo preg_quote($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
a-zA-Z0-9.-_~!$&'()*+,;=:@ Fatal error: Uncaught Error: Undefined constant "PHO_EOL" in /in/66ElX:5 Stack trace: #0 {main} thrown in /in/66ElX on line 5
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
a-zA-Z0-9.-_~!$&'()*+,;=:@ Warning: Use of undefined constant PHO_EOL - assumed 'PHO_EOL' (this will throw an Error in a future version of PHP) in /in/66ElX on line 5 PHO_EOLa\-zA\-Z0\-9\.\-_~\!\$&'\(\)\*\+,;\=\:@
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
a-zA-Z0-9.-_~!$&'()*+,;=:@ Notice: Use of undefined constant PHO_EOL - assumed 'PHO_EOL' in /in/66ElX on line 5 PHO_EOLa\-zA\-Z0\-9\.\-_~\!\$&'\(\)\*\+,;\=\:@
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
a-zA-Z0-9.-_~!$&'()*+,;=:@ Notice: Use of undefined constant PHO_EOL - assumed 'PHO_EOL' in /in/66ElX on line 5 PHO_EOLa-zA-Z0-9\.-_~\!\$&'\(\)\*\+,;\=\:@

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