How can the error "Cannot send session cookie - headers already sent" be resolved in PHP scripts?

The error "Cannot send session cookie - headers already sent" occurs when there is output (such as HTML, whitespace, or error messages) sent before PHP tries to set a session cookie. To resolve this issue, make sure that no output is sent before session_start() is called in your PHP script. 

<?php
ob_start(); // Start output buffering
session_start(); // Start the session

// Your PHP code here

ob_end_flush(); // Flush the output buffer
?>

Keywords

session cookie headers PHP scripts resolve

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