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

Since most of the types requested are Microsoft Office related, this link has all of the office mime types (the best focused source I've found so far): http://filext.com/faq/office_mime_types.php