I’m not doing .net for now — I’ve gotten interested in PHP, so I’m learning PHP while working on it. There are a shocking number of baffling things in the beginner stage; good thing I was mentally prepared. Last night I ran into a problem: in PHP, session_start() always threw an error: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at D:wwwrootEZineTest.php:1) in D:wwwrootEZineTest.php on line 1 I searched all over the web and found three explanations and fixes for it: