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run code in 300+ PHP versions simultaneously
<?php var_dump(getenv());
Output for 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 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
array(8) { ["TERM"]=> string(5) "xterm" ["PATH"]=> string(13) "/usr/bin:/bin" ["LANG"]=> string(1) "C" ["SHELL"]=> string(7) "/bin/sh" ["MAIL"]=> string(16) "/var/mail/nobody" ["LOGNAME"]=> string(6) "nobody" ["USER"]=> string(6) "nobody" ["HOME"]=> string(4) "/tmp" }
Output for 5.5.38, 5.6.24 - 5.6.40, 7.0.9 - 7.0.33
Warning: getenv() expects at least 1 parameter, 0 given in /in/fkFoR on line 3 bool(false)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.23, 7.0.0 - 7.0.8
Warning: getenv() expects exactly 1 parameter, 0 given in /in/fkFoR on line 3 bool(false)

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