Upgrading system software (PHP, Apache, MySQL, etc) is well outside of the scope of user to user support on these forums, and really should be done by your data center or someone extremely capable of handling system upgrade tasks; this is especially true in the case of migrating from MySQL to MariaDB.
It is extremely easy for one who is not familiar with upgrading system utilities via command line (or even via EasyApache for WHM) to make mistakes, and even neglect to tune their newly installed services, and that is not a level of troubleshooting that we're prepared to offer.
