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Lessons PHP Connecting MySQL Bookmark and Share
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The free and open-source MySQL database is very often used with PHP. Before we can store and / or access data in a database, we must create a connection to the database. PHP provides us a function mysql_connect() to do just that. Its syntax follows:

mysql_connect(servername, username, password);

Servername: Specifies the database server to connect to. This is optional. If we do not provide the servername, it defaults to "localhost:3306".
Username: Specifies the usernamme to use to log in to the database server. This one is also optional. If we do not provide a username it defaults to the name of the user that owns the server process.
Password: Specifies the password to log in with. This is also optional. If we do not provide a password, it defaults to "".

Followig is a very simple example that shows us how to connect to a MySQL database in PHP:

$con = mysql_connect("localhost", "adam", "ada");
if (!$con)
die('Error connecting database!');
// some code

In the above example the database connection handler, returned by the mysql_connect() function, is stored in a variable $con for later use in the script. Please note that the die() part is executed in case the connection to the database fails.

Closing MySQL Connection
The connection the database automatically closes as and when the script ends. If we need to close the connection before the script ends, we use the mysql_close() function as under:

$con = mysql_connect("localhost", "adam", "ada");
if (!$con)
die('Error connecting database!');
// some code
mysql_close($con); // close the database connection

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