What potential issues or errors could arise when using the "header" function for file downloads in PHP?

One potential issue that could arise when using the "header" function for file downloads in PHP is the headers already being sent error. This error occurs when there is any output sent to the browser before the "header" function is called, which prevents the headers from being modified. To solve this issue, you can use output buffering to capture any output before sending headers. 

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

// Your file download code here

ob_end_clean(); // Clean (erase) the output buffer

Keywords

header function file downloads PHP errors

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