What could be causing the "Cannot send session cookie - headers already sent" error in PHP?

The "Cannot send session cookie - headers already sent" error in PHP occurs when there is output sent to the browser before session_start() is called. To solve this issue, make sure there is no whitespace or any other output before session_start() is called in your PHP script. 

<?php
ob_start(); // Start output buffering
session_start(); // Start the session
// Rest of your PHP code here
?>

Keywords

PHP session cookie headers error output buffering

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