...config.php....
<?php
$db=Array("host"=>"localhost",
"login"=>"admin",
"pass"=>"qwerty",
"db"=>"test",
"charset"=>"utf8"
);
...
.....index.php....
include "config.php";
$mysqli = new mysqli($db["host"],$db["login"],$db["pass"],$db["db"]);