How Can I Detect PHP\'s `post_max_size` Upload Errors?

Handling PHP Files Exceeding post_max_size

PHP provides two settings, upload_max_filesize and post_max_size, to limit file uploads. If a file exceeds upload_max_filesize, PHP returns its size as 0, while exceeding post_max_size results in a silent script failure.

Is there a way to catch the post_max_size error?

According to the documentation, post_max_size errors result in empty $_POST and $_FILES arrays. This can be detected by passing a $_GET variable to the processing script (e.g.,

) and checking its existence.

However, PHP does not send an explicit error, so alternative approaches are necessary:

• Comparing post_max_size and $_SERVER['CONTENT_LENGTH']: This comparison includes not only the file size and post data but also multipart sequences. By checking this difference, you can identify potential post_max_size errors.

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