How can the issue of headers already being sent before setting a session in PHP be prevented to avoid errors?

When headers are sent before setting a session in PHP, it can cause errors because sessions rely on headers to store and retrieve session data. To prevent this issue, ensure that no output is sent to the browser before starting a session by placing session_start() at the beginning of the script before any HTML or whitespace. 

<?php
// Start the session at the very beginning of the script
session_start();

// Rest of your PHP code goes here
?>

Keywords

headers session output buffering ob_start error

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