Header redirect not initializing PHP [duplicate] - php

Question

This question already has answers here:
How to fix "Headers already sent" error in PHP
(11 answers)
Closed 7 years ago.
I'm having a small issue with a header redirect on a login form. I have debugged the If & While statement and they both work fine, which surely can only be the header. I have tried redirecting it too numerous sites and pages but still nothing. Would really appreciate any help. Thanks!!!
<center>
<?php
include './index.php';// This is a login form
include './connection.php';// SQl connection page
include './session.php'; // Sessions page
error_reporting(E_ALL);
$mysqli = new mysqli ("c3433870.co.uk.mysql", "c3433870_co_uk", "BFUWGpn3", "c3433870_co_uk");
if($mysqli->connect_errno > 0) {
die('Unable to connect to database [' . $mysqli->connect_error . ']');
}
session_start();
if(isset($_POST['submit'])){
$stmt = $mysqli->prepare("SELECT username, password FROM users WHERE username=? AND password=? LIMIT 1");
$username = $_POST['username'];
$password = $_POST['password'];
$stmt->bind_param('ss', $username, $password);
$stmt->execute();
$stmt->bind_result($username, $password);
$stmt->store_result();
if($stmt->num_rows == 1) //To check if the row exists
{
while($stmt->fetch()) //fetching the contents of the row
{
$_SESSION['Login_sessions'] = true;
$_SESSION['login_user'] = $username;
header('Location: ./profile.php');
}
}
else {
echo "Wrong Username or Password!";
}
$stmt->close();
$stmt->free_result();
}
else
{
echo "Not Found";
}
$mysqli->close();
?>
</center>

Answer 1

Server headers are sent after the first echo. when you echo your center tag you thwart yourself.
Since the headers are already sent, you cannot change the location inside.
For this same reason, it is considered best practice not to close your php tags, as the php parser doesn't care either way.
I would remove the ?>