How can one troubleshoot and resolve issues related to modifying header information in PHP?

When modifying header information in PHP, it is important to ensure that no output has been sent to the browser before calling functions like header(). To troubleshoot and resolve this issue, you can use output buffering to capture any output before sending headers. This can be achieved by using ob_start() at the beginning of your script and ob_end_flush() at the end to flush the output buffer. 

<?php
ob_start();

// Your PHP code here

ob_end_flush();

Keywords

header() output buffering ob_start() ob_end_flush() headers already sent

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