From php-program, I used pdo function(prepare) to MySQL.
--> Then "could not find driver" was displayed.
Fatal error: Uncaught Error: Call to a member function prepare() on null in ....
The program already worked in old version.
So I used phpinfo() to show the status of php.
--> 'PDO drivers' field shows 'no value'.
Does it mean that I must install php-mysqlnd manually?
If so, where can I get and how to install?