PHP code for Database connection

//Database connection code


//mysql_connect(servername,username,password);

$con = mysql_connect("localhost","","");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
mysql_select_db("my_db", $con);
$result = mysql_query("SELECT * FROM Persons");
while($row = mysql_fetch_array($result))
{
echo $row['FirstName'] . " " . $row['LastName'];
echo "
";
}
mysql_close($con);
?>