How can PHP developers troubleshoot and fix issues related to headers already being sent in their code?

Issue: PHP developers can troubleshoot and fix issues related to headers already being sent by ensuring that no output is sent to the browser before calling functions like header() or setcookie(). This can be achieved by checking for any whitespace or HTML content before the PHP opening tag or removing any unnecessary output statements. Example Fix: 

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

// Your PHP code here

ob_end_clean(); // Clean the output buffer without sending it to the browser

Keywords

output buffering ob_start ob_end_flush header headers_sent

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