What is the potential issue with using "header" to open the Windows-Explorer for file download in PHP?

When using the "header" function to open the Windows-Explorer for file download in PHP, there is a potential issue with headers already being sent to the browser before the file download starts, which can cause errors. To solve this issue, you can use output buffering to prevent any output from being sent to the browser before the file download. 

<?php
ob_start();
// Your file download code here

// Clear the output buffer
ob_end_clean();

Keywords

header Windows-Explorer file download PHP potential issue

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