When a file exceeds the php file upload limit and maximum upload size per file is empty...

First I would like to say, great module! It was exactly what I was looking for.

When the maximum upload size per file is left empty, FUpload allows files of any size to be uploaded. If the file exceeds the php upload limit, an “Upload failed:” error is generated with no additional details and dblog contains an entry “implode() [function.implode]: Invalid arguments passed in usr/www/users/ucpclass/sites/all/modules/image_fupload/image_fupload.module on line 206.”.

The root of the implode bug appears to be when the $_FILES['files']['error'] flag is set. The file_save_upload() function, in drupal core, utilizes drupal_set_message() to display the error and not form_set_error(). Patch to follow, it’s not a complete fix, as IMHO the file size check should occur before upload, but will allow for the error details to be added to the “Upload failed” message and prevent the exception with the call to implode.