如何避免：警告：POST内容长度47820076字节超过了第0行的Unknown中的8388608字节限制

Question

I am posting an image file to the server and everything is fine. However, in cases when the user posts something bigger I get this warning. What could I do to avoid this warning?

I don't want solutions that would hide the warning nor increase the post size. I want something that would block the request from uploading the file to the server entirely and catch that warning.

Answer 1

This is what worked for me. It seems that when PHP sees a file that is too large, deletes all the POST data. So this code fragment worked for me:

if ($_SERVER['REQUEST_METHOD'] == 'POST' && count($_POST) < 1 ) {
    $_SESSION['error'] = 'File upload size exceeded';
    header('Location: index.php');
    return;
}

Of course your page should be designed not to submit empty POST pages with no input parameters.

Answer 2

One thing what you can do is give a maximum size on the HTML form.

<input type="hidden" name="MAX_FILE_SIZE" value="4194304" /> 

It's not bulletproof, but it has some impact. Why this is not so good is explained in this comment - it is only checked by PHP, so uploading will start and continue up until this limit is reached.

My recommendation is that you could use that together with a javascript solution, as described here . It only works if javascript is enabled, of course.