prepared selection shows blank page - php

Question

I just set up the prepared query selection but it seems like it does not work.. It shows blank page instead of the content it should show..where is problem?
<?php
$servername = "";
$username = "";
$password = "";
$dbname = "";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$stmt = $mysqli->prepare('SELECT configured FROM members WHERE username = ?');
$stmt->bind_param('s', $username);
$stmt->execute();
$stmt->bind_result($username);
while ($stmt->fetch()) {
if($row['configured'] == ""){
if (isset($_SESSION['user_id'])) {
?>
With this code I want to check if user has configured his settings and so if yes, then if he is logged in. But the page shows nothing even though I have there everything correct after that code I posted...

Answer 1

You're using $conn to connect with, then $mysqli in your prepare statement.
This
$stmt = $mysqli->prepare
Which should read as
$stmt = $conn->prepare
Also make sure you've started the session.
http://php.net/manual/en/function.session-start.php
Check for errors:
http://php.net/manual/en/function.error-reporting.php
and you have 3 missing closing braces in your posted code.
I see you're using $username = ""; in your DB connection and then using the same variable to bind with.
Add error reporting to the top of your file(s) which will help find errors.
<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
// rest of your code
Sidenote: Error reporting should only be done in staging, and never production.