class.upload.php is a powerful and mature PHP class to manage uploaded files, and manipulate images in many ways. The script is available under a GPL license.
more info about the class
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$handle = new Upload($file); $handle->allowed = array('application/x-pdf', 'application/acrobat', 'applications/vnd.pdf', 'text/pdf', 'text/x-pdf');
Many thanks
Does it do the same with any PDF documents?
please have look at this thread on github:
https://github.com/joomlaworks/k2/issues/54