How Can I Handle File Uploads Larger Than PHP\'s `post_max_size`?

Handling Large File Uploads Beyond PHP's post_max_size

When handling file uploads in PHP, it's crucial to cater for situations where the uploaded file exceeds the server's configuration limits. While PHP handles files smaller than upload_max_filesize gracefully, handling files larger than post_max_size poses a challenge.

To detect files larger than post_max_size, which can cause scripts to fail silently, PHP does not provide a straightforward error mechanism. However, there are ways to work around this limitation.

Empty $_POST and $_FILES Arrays

As per the official documentation, when the size of posted data exceeds post_max_size, both the $_POST and $_FILES superglobals become empty. By leveraging this behavior, you can modify your script to check for empty arrays after a form submission.

Comparing CONTENT_LENGTH with post_max_size

An alternative approach involves comparing the value of $_SERVER['CONTENT_LENGTH'] with post_max_size. CONTENT_LENGTH includes the size of the uploaded file, post data, and multipart sequences. If CONTENT_LENGTH exceeds post_max_size, it's likely that your file is too large.

By incorporating these techniques, you can gracefully handle files that exceed PHP's post_max_size and prevent your scripts from failing silently or returning blank forms.

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