> 1. What is the difference between working with PHP and MySQL on a local
> server and working with PHP and MySQL when MySQL is on a remote server
None in terms of functionality.
> 2. What is the protocol used to connect to MySQL on a local server and
> what is the protocol used to connect to a remote MySQL server?
On the local machine a client (PHP is a client) can connect through unix
sockets or TCP (3306). On a remote machine its TCP only. Unix sockets access
is faster than TCP.
> 3. Is there a difference in performance between connecting from PHP to
> MySQL on a remote server or PHP to MSSQL Server?
See above answer. Also you have any TCP/IP overhead to add on.
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