How do I catch this error?

[sKunKbad]

I'm working on a file uploading script. It checks the file size, and won't let an upload complete if over a size specified in config. This all works, but if a file is uploaded that goes over PHP's limit, then I get the familiar warning:

 

Warning: POST Content-Length of 14622352 bytes exceeds the limit of 8388608 bytes in Unknown on line 0

 

I am not looking to allow this file to go through. I don't want to increase memory or the max post size. That's not the issue.

 

The upload script already has a way for the user to see if their file had problems uploading (showing errors), but how can I catch the error shown above? I know the error won't display if the error reporting and display of errors is turned off, but I don't want to leave the user in the dark. They should get some feedback. What can I do here?

[mac_gyver]

first check if a form has been submitted using $_SERVER['REQUEST_METHOD'] == "POST". then both the $_FILES and $_POST array will be empty for that condition or you can check $_SERVER['CONTENT_LENGTH'] to get the same information that is output in that warning message.

Edited July 18, 2013 by mac_gyver

[sKunKbad]

first check if a form has been submitted using $_SERVER['REQUEST_METHOD'] == "POST". then both the $_FILES and $_POST array will be empty for that condition or you can check $_SERVER['CONTENT_LENGTH'] to get the same information that is output in that warning message.

How about something like this:

if( isset( $_SERVER["CONTENT_LENGTH"] ) && $_SERVER['REQUEST_METHOD'] == "POST" )
{
	if( $_SERVER["CONTENT_LENGTH"] > ( (int) get_cfg_var('post_max_size') * 1024 * 1024 ) )
	{
		$this->error_stack[] = 'File size too large to upload.';
	}
}

I'm using get_cfg_var because it works on all of the servers I tested, while ini_get didn't work on Litespeed.