phpFox Requirements.

PHP version >= 5.6
Support JSON library.
Support multi-byte string library
Support XML library
Support image Process library
Support mysqli driver.
Support file archive, compressed with Zip.
Support execute shell command.
Support libcurl, connect to remote service.

phpFox Recommendations.

PHP version >= 7.2 (Current your PHP v7.1.30)
SSL/TLS Certificate
Support OPcache
Support APCu
Support Redis extension if redis cache is enabled
Support upload Images Next-Gen formats with Imagick