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

The issue of headers already sent in PHP when using session_start() 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 HTTP headers, but there is already output sent to the browser. To solve this, make sure to place session_start() at the very beginning of your PHP script, before any HTML or whitespace. 

<?php
ob_start(); // Output buffering to prevent headers already sent error
session_start(); // Start the session
?>

Keywords

headers session_start output buffering ob_start ob_end_clean

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