PHP header redirect - Not Working - php

Question

This is the code:
if($rowCheck>0) {
session_start();
while($row = mysql_fetch_assoc($check)) {
$_SESSION['developer'] = $row;
}
header("Location: http://".$_SERVER['SERVER_NAME']."/index.php");
}
else
echo 'Invalid Password or Email!';
Everything is working fine except the header, and if i write an echo after the header it will work normally. Also if i printed the location, it will show me the exact and right location.
I'm running on mamp and macos. So it's on a localhost.
Any help ?

Answer 1

As scott said, you need the exit() or die() after the header.
Also, check that there are no empty spaces before or after your opening and closing php tags, like this:
<?php
That will cause header functions to fail, as it is considered input. Any related include files should be checked as well.

Answer 2

Add exit() or die() after the header line. The header function does not stop execution of the rest of the script.

Answer 3

just comment everything and paste at the right beginning header("Location: http://".$_SERVER['SERVER_NAME']."/index.php"); and see if it is working. If not, check for a BOM encoding.

Answer 4

Couple things.
First I would put ini_set("display_errors", 1); at the very top of your page within the PHP code. You may be getting a "headers already sent" error.
Add an exit after the header to keep the script from going any further:
header("Location: http://".$_SERVER['SERVER_NAME']."/index.php");
exit;
Lastly this bit doesn't make sense.
while($row = mysql_fetch_assoc($check)) {
$_SESSION['developer'] = $row;
}
You're setting that session variable once so you don't need the while. You're also setting it equal to a mysql resource (which you may intend to do), but maybe you just need a column
$row = mysql_fetch_assoc($check);
$_SESSION['developer'] = $row['username'];