There are currently 2 major PHP versions in use; PHP 7 and PHP 8. PHP 8 is not 100% backward-compatible with PHP 7 (the way some things are done have changed), so your PHP 7 scripts may not run under PHP 8.
On our servers the default PHP version is 8.2.x. This is compatible with most scripts currently available. Unless your scripts require an earlier version of PHP, we suggest you use the default server version.
The "MultiPHP" configuration option within cPanel can be used to switch PHP version for your hosting.
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