PHP xls, xlsx, ppt, pptx headers

Question

Here is my code where I am trying to send a correct header depedning on a type of a document. I figured out the headers for pdf, doc and docx but I still need to know correct he

Answer 1

See http://www.w3schools.com/media/media_mimeref.asp .

xls is application/vnd.ms-excel, ppt is application/vnd.ms-powerpoint.