"Cannot send session cache limiter - headers already sent"
http-headers, php, session
Solution
"Headers already sent" means that your PHP script already sent the HTTP headers, and as such it can't make modifications to them now.
Check that you don't send ANY content before calling `session_start`. Better yet, just make `session_start` the first thing you do in your PHP file (so put it at the absolute beginning, before all HTML etc).
Problem
Every time I try to start a session on a particular page I get the following error: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at ............ on line 23 using this code: ``` <?php session_start(); if(isset($_SESSION['user'])) { $user = $_SESSION['user']; echo "$user"; } else { } ?> ``` Is it suggesting I've already used `session_start();`?