How to use php to link with database.

Answer 1

Definition and Usage

The mysqli_connect() function opens a new connection to the MySQL server.

for example:
mysqli_connect(host,username,password,dbname,port,socket);

also check:
http://www.w3schools.com/php/func_mysqli_connect.asp
http://php.net/manual/en/function.mysqli-connect.php

Answer 2

You have to make connections to database using pdo or mysqli. Mysqli is used for MySQL database.