标头重定向后PHP $ _SESSION为空

Question

I'm losing the data in $_SESSION when I do a header redirect. When I walk through this with a debugger I can see all my data in $_SESSION before I exit();

Login.php :

...

if($result == 1){       
    header("Location: /myaccount.php");
    session_write_close();
    exit();
} else {
    header("Location: /login.php?invalid=yes");
    exit();
} 

Then I put a breakpoint after the session_start() conditional below and $_SESSION is completely empty.

myaccount.php:

<?php
if(!isset($_SESSION['user_id'])) { session_start(); }

$docRoot = getenv("DOCUMENT_ROOT");
...

Where did my session go?

Answer 1

Make sure you are using the function session_start(); before the if-statement on myaccount.php