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Simple password protecting of a page: What am I doing wrong here?

For my test environment site I want anyone who views it to have to type in a password once per session. When their session starts, they type in the password and are redirected to the page they were trying to view. So I have at the top of every page

// For test site, require login
if ( !$_SESSION['loggedIn'] )
{
    $pagetarget = $_SERVER['REQUEST_URI'];
    include "test_login.php";
    die();
}

and then test.login.php is

<?php 
    if ( $_POST['password'] == '091u233j12j3' )
    {  
       $_SESSION['loggedIn'] = true;
       header("Location: " . $pagetarget);
       die();
    }
?>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Test Environment Login</title>
</head>
<body>
    <form method="POST">
        <p>Enter password to unlock <b>test.mysite.com</b>: <input type="text" name="password" /><input type="submit" /></p>
        <p>You will be redirected to the page you tried to access.</p>
        <input type="hidden" name="pagetarget" value="<?php echo $pagetarget; ?>" />
    </form>
</body>
</html>

but the page redirection isn't working. What am I doing wrong?

You need a call to session_start() at the beginning of every script before you can use $_SESSION .

Example:

session_start();
if ( !$_SESSION['loggedIn'] )
{
    $pagetarget = $_SERVER['REQUEST_URI'];
    include "test_login.php";
    die();
}

Try this :

// For test site, require login
session_start(); 
if ( !$_SESSION['loggedIn'] )
{
    $pagetarget = $_SERVER['REQUEST_URI'];
    include "test_login.php";
    die();
}

and test_login.php

<?php 
if ( $_POST['password'] == '091u233j12j3' )
{  
   $_SESSION['loggedIn'] = true;
   header("Location: " . $_POST['$pagetarget']);
   die();
}
?>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
(...)

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