how to check the uploaded file type is pdf [duplicate]

Answer 1

You can check the MIME type of the file using PHP's File Info Functions. If it returns with the type 'application/pdf' then it should be a PDF.

The File Info Functions were added in PHP 5.3 but previous to that you are able to use the mime_content_type function.

Answer 2

Look for the PDF magic number by opening the file and reading the first few bytes of data. Most files have a specific format, and PDF files start with %PDF.

You can check the first 5 characters of the file, if they equal "%PDF-", it is likely a real PDF (however, this does not definitively prove that it is a PDF file, as any file can begin with those 5 characters). The next 4 characters in a proper PDF file contain the version number (i.e. 1.2).

Answer 3

mime_content_type('file.ext');

mime_content_type()