How to connect with php mysql database ?

The most Popular databases used with the php is MySQL .

You can Connect with Php MySQL using  mysql_connect() function and mysql_select_db() function  to  select the database . 
Rules : 

$connection = mysql_connect(‘localhost’, ‘mysql_username’, ‘mysql_password’);
if (!$connection) {
    die(‘You are not connected to database  : ‘ . mysql_error());
// make foo the current db

$select_db = mysql_select_db(‘my_database’, $connection);
if (!$select_db) {
    die (‘Database is not selected  : ‘ . mysql_error());

Here ,
mysql_connect() function establish connection with database .
mysql_select_db() is used the select the current database .
mysql_error() returns the connection errors .

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