3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var_name = "_SERVER"; var_dump(${$var_name});
Output for 7.1.25 - 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(17) { ["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" ["PHP_SELF"]=> string(9) "/in/LPTSv" ["SCRIPT_NAME"]=> string(9) "/in/LPTSv" ["SCRIPT_FILENAME"]=> string(9) "/in/LPTSv" ["PATH_TRANSLATED"]=> string(9) "/in/LPTSv" ["DOCUMENT_ROOT"]=> string(0) "" ["REQUEST_TIME_FLOAT"]=> float(1573631343.0001) ["REQUEST_TIME"]=> int(1573631343) ["argv"]=> array(1) { [0]=> string(9) "/in/LPTSv" } ["argc"]=> int(1) }

preferences:
190.72 ms | 409 KiB | 5 Q