How can headers already sent errors be avoided when implementing file downloads in PHP?

Headers already sent errors can be avoided when implementing file downloads in PHP by ensuring that no output is sent to the browser before sending headers. This can be achieved by using output buffering functions like ob_start() and ob_end_clean() to buffer the output before sending headers. Additionally, make sure there are no spaces or lines before the opening <?php tag in your PHP file. 

&lt;?php
ob_start();

// Your file download logic here

ob_end_clean();

Keywords

output buffering ob_start ob_end_flush Content-Disposition flush

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