Making a connection with Hosting and Database

However, an error is coming up



with the source code I made:

$SERVER ="yoongda.com";
$USERNAME ="yoongda";
$PASSWORD ="******";

$conn= mysql_connect($SERVER,$USERNAME,$PASSWORD );
if (! $conn)
{
//Can not connect to the Database, Report error
die ('Connection Error'.mysql_error());
} else
{
echo('Database is connected');
}

//end If

//Closing the connection
mysql_close($conn);