I mean I have set PHP version to 7 from cpanel (using inherit). Now does other requirements are available in heliohost? In their documentation, theu said requirements are: ★PHP 7.0+ gmp mbstring curl openssl * PHP 7.1+ is recommended for better performance. For PHP 5.6 or HHVM compatibility, use the v1.x releases. I know that heliohost supports mbstring, curl and openssl. But I am not sure if heliohost (specifically tommy) whether supports gmp or not.