How can the issue of headers already sent be resolved when using session_start() in PHP?

When using session_start() in PHP, the issue of headers already sent can be resolved by ensuring that there is no whitespace or output before the session_start() function is called. This error occurs when PHP tries to send headers (like cookies) to the browser after some content has already been sent. To fix this, make sure to call session_start() at the very beginning of your PHP script, before any HTML or whitespace. 

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

// Rest of your PHP code goes here

ob_end_flush(); // End output buffering and send content to the browser
?>

Keywords

headers session_start output buffering ob_start PHP

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