PHP installation missing the MySQL extension

I have wordpress installed on a shared hosting service, and was getting messages on the cPanel saying mySQL was an old version and insecure, so arranged migration to a server with more up to date mySQL on it.

At the same time I asked for a more up to date PHP version, as it was on 5.1 – because something or other (Unfortunately can’t remember which plugin now) didn’t like that version, and wanted 5.3

I’m now currently on mySQL 5.6 and PHP 5.6

My wordpress site was running before the migration, but will not now load.

The message is

“Your PHP installation appears to be missing the MySQL extension which is required by WordPress.”

On the cPanel I can see that I have PHP version 5.6 installed with ticks against both the mysql and mysqli extensions. I have also tried PHP version 5.3 with the same two ticks applied.

I’m a little out of my depth now, and don’t know what to try.

I have a huge list of other PHP extensions, and about half a dozen PHP settings, which I can switch on or off myself, if that’s where the solution might lie.

On some previous posts about this message, there is talk about editing php.ini and then rebooting servers. If this is necessary, please let me know what to edit and where to find the right php.ini file (folders etc). However, I assume I can’t reboot a server, as it’s shared.

Hope I’ve given enough information; all advice on what to do next would be very welcome!

regards
Graham