db connection on server

gistfile1.txt

<?php 
$db['db_host'] = "localhost:3306";
$db['db_user'] = "enterusername";
$db['db_pass'] = "enterpass";
$db['db_name'] = "dbname";

foreach ($db as $key => $values ){
    
    define(strtoupper($key), $values);
}

$connection = mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);

$connect = new PDO("mysql:host=localhost:3306;dbname=enterdbname", "enterusername", "enterpass");