What steps can be taken to troubleshoot and debug PHP scripts that result in "headers already sent" warnings?

When encountering "headers already sent" warnings in PHP scripts, it typically means that there is output being sent to the browser before headers are set. To troubleshoot and debug this issue, you can check for any whitespace or characters outside PHP tags before the opening <?php tag, remove any unnecessary output, ensure there are no echo or print statements before setting headers, and use output buffering to capture any output before sending headers. 

&lt;?php
ob_start(); // start output buffering

// your PHP code here

ob_end_flush(); // flush output buffer

Keywords

PHP headers already sent troubleshooting debugging error_reporting

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