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run code in 300+ PHP versions simultaneously
<?php $output = shell_exec('ls -lart'); echo "<pre>$output</pre>";
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, 7.2.0 - 7.2.34, 7.3.0 - 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
Warning: shell_exec(): Unable to execute 'ls -lart' in /in/cA0Xd on line 2 <pre></pre>

preferences:
266.9 ms | 405 KiB | 415 Q