How can developers effectively debug PHP code to identify and resolve issues like the "Headers already sent" error?

Issue: The "Headers already sent" error in PHP occurs when the server sends headers to the client, but there is already output (such as whitespace or HTML) sent before the headers. To resolve this issue, developers should ensure that no output is sent before calling functions like header() or setcookie(). PHP code snippet to fix the "Headers already sent" error: 

<?php
ob_start(); // Start output buffering

// Your PHP code here

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

Keywords

PHP debugging Headers already sent error troubleshooting

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