Please search first next time: https://infinityfree.net/support/search?q=putenv
https://forum.infinityfree.com/discussion/297/putenv-php-extension
https://forum.infinityfree.com/discussion/225/putenv-php-extension-is-disabled-my-site-needs-it-enabled
https://forum.infinityfree.com/discussion/422/putenv-php-extension-is-required
https://forum.infinityfree.com/discussion/278/putenv-php-is-required