define("WEBDOMAIN", "your host");
define("DEFDBNAME", "your db name");
define("DEFUSERNAME", "your user");
define("DEFDBPWD",  "your pwd");
 
if(!$conn = connectDb()) {die("err db");} else {$conn->query("SET NAMES 'utf8';");}
 
function connectDb() {
	if ($conn = @new mysqli(WEBDOMAIN, DEFUSERNAME, DEFDBPWD, DEFDBNAME)) return $conn; else return false;
}