config.db.php

<?php

// SERVER NAME
$serverName = $_SERVER['SERVER_NAME'];
$productionServer = "";

// SET DATABASE LOCAL/PRODUCTION
if ( $serverName == "localhost") {
  $mysqli_host = "127.0.0.1";
  $mysqli_user = "root";
  $mysqli_pass = "";
  $mysqli_db = "";
} else if ( $serverName = $productionServer ) {
  $mysqli_host = "";
  $mysqli_user = "";
  $mysqli_pass = "";
  $mysqli_db = "";
}

// CONNECT TO THE DATABASE
$mysqli_con = mysqli_connect( $mysqli_host, $mysqli_user, $mysqli_pass,  $mysqli_db );

// CHECK THE DATABASE CONNECTION
if ( mysqli_connect_errno ( $mysqli_con ) ) {
  echo "Failed to connect to the database: " . mysqli_connect_error();
}

Hey,

Line 13: Theres a problem.

its supposed to be double == instead of one.