How to Gracefully Handle File Uploads Exceeding PHP\'s `post_max_size` Limit?

Gracefully Handling Files Exceeding PHP's post_max_size

When dealing with file uploads in PHP, it's crucial to handle cases where the uploaded file size surpasses PHP's limitations defined by the upload_max_filesize and post_max_size settings. Unlike upload_max_filesize, which returns a size of 0 for oversized files, post_max_size violations lead to silent script failures.

To address this issue, PHP documentation suggests tracking for the absence of the $_POST and $_FILES superglobals, which occurs when post data exceeds post_max_size. One approach is to pass a parameter via the URL (e.g.,

), which can be checked in the PHP script to determine whether the POST was successfully received.

Another option proposed by a commenter involves comparing $_SERVER['CONTENT_LENGTH'] to post_max_size. $_SERVER['CONTENT_LENGTH'] includes not only the uploaded file size and POST data but also multipart sequences, providing a comprehensive check for potential size violations.

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