PHP
Warning session start headers already sent
Warning: session start() [function.session-start]: Cannot send session cache limiter - headers already sent
We see this problem when we put the session_start() in the wrong position. You can't send any content before starting the session. Sometimes we call the session in the header. You will never do that.
The session_start() function must be called before any output is sent to the browser because it sends a header to the browser to set up the session. If any output has already been sent to the browser, the headers have already been sent and cannot be modified, resulting in the error message.
Put Your session_start() into Top of the page
<?php
session_start();
ob_start();
?>
<html>
<head>
</head>
<body>
</body>
<html>
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