Question

I want one website on one server and another website on another server, but only 1 database for both using php and mysql.
is it possible? if yes then how?

Answer 1

Yes. its possible. Normally you dont put your db on distant server. You should keep the db server on same data center so you avail high speed internal network link.

If your websites are in host web1 and web2 and database is in dbhost1, then in web1 and web2 connect to mysql with dbhost1 as host name.

mysqli

$mysqli = new mysqli("dbhost1", "user", "pass");

PDO

$dbh = new PDO('mysql:dbname=dbname;host=dbhost1', "user", "pass");

Legacy mysql extension

mysql_connect("dbhost1",  "user", "pass");

Note: Make sure in the database user@web1 (on host web1) or user@web2 (on host web2) has access.