title: PHP Upload PDF mime type is application/unknown
body: <p>I am having this problem uploading PDFs to site.</p>
  
  <p>I try it on one a computer, OS X,  the mime/type is application/unknown. But when I try to upload the PDF from another mac, after sending it over by email, the mime/type is application/pdf.</p>
  
  <p>What could be causing this problem?</p>
  
  <p>Upload is done through PHP so I get the mime/type through $_FILE['name']['type']</p>