3v4l.org

run code in 300+ PHP versions simultaneously
<?php foreach($_SERVER as $k => $v) { if(is_string($v)) { echo("$k => $v "); } else if(is_array($v)) { foreach($v as $k => $inv) { ech("$k => $inv "); } } }
Output for 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
TERM => xterm PATH => /usr/bin:/bin LANG => C SHELL => /bin/sh MAIL => /var/mail/nobody LOGNAME => nobody USER => nobody HOME => /tmp PHP_SELF => /in/9MG6E SCRIPT_NAME => /in/9MG6E SCRIPT_FILENAME => /in/9MG6E PATH_TRANSLATED => /in/9MG6E DOCUMENT_ROOT => Fatal error: Uncaught Error: Call to undefined function ech() in /in/9MG6E:10 Stack trace: #0 {main} thrown in /in/9MG6E on line 10
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
TERM => xterm PATH => /usr/bin:/bin LANG => C SHELL => /bin/sh MAIL => /var/mail/nobody LOGNAME => nobody USER => nobody HOME => /tmp PHP_SELF => /in/9MG6E SCRIPT_NAME => /in/9MG6E SCRIPT_FILENAME => /in/9MG6E PATH_TRANSLATED => /in/9MG6E DOCUMENT_ROOT => Fatal error: Call to undefined function ech() in /in/9MG6E on line 10
Process exited with code 255.
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207.84 ms | 402 KiB | 332 Q