Getting error: “Fatal error: Call to undefined function mysqli_connect()”
this is a problem with your hosting, the php installation in particular.
if you have access to the php.ini configuration file you should search for
If there is a semi collon ( in front of this line, remove it. You will have to restart the apache server (not certain if you have to, but it’s always a good idea to do)
If this doesn’t work I suggest you contact your hosting for further support.