3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php putenv('FOO=BAR'); echo getenv('FOO') . PHP_EOL; putenv('FOO=BAZ'); echo getenv('FOO') . PHP_EOL;
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.1
BAR BAZ