如何设置php会话？ [重复]

How would I set a php session? Here's my code , yet it should work when I require it on the logged in page it just redirects me to the login page (its not set)

<?php
   $_SESSION['logged_in']==1;
   header('Location: loggedin.php');
?>

</div>

Use = to assign not ==. Double equal is used to compare. Also use session_start(); top of your code. Example:

session_start();
$_SESSION['logged_in'] = 1;
header('Location: loggedin.php');

You use double equal to sign (==) while comparing 2 quantities. You've to use 1 equal sign to assign value.

It should be:

<?php
   session_start();
   $_SESSION['logged_in']=1;
   header('Location: loggedin.php');
?>