Mysql connect

$mysql_host="localhost";
$mysql_username="myusername";
$mysql_password="dbpassword";
$mysql_database="datbasename";

$db = mysql_connect("$mysql_host", "$mysql_username", "$mysql_password");
if (!$db) {
die('Could not connect: ' . mysql_error());
}

$db_selected = mysql_select_db("$mysql_database", $db);
if (!$db_selected) {
die ('Could not connect : ' . mysql_error());
}