Make use of the finfo() functions. A simple illustration: <?php $finfo = finfo_open(FILEINFO_MIME_TYPE); echo finfo_file($finfo, “path/to/image_dir/image.gif”); finfo_close($finfo); OUTPUT : image/gif Note : Windows users must include the bundled php_fileinfo.dll DLL file in php.ini to enable this extension.
http://www.iana.org/assignments/media-types/ lists the “official” mime-types, but it doesn’t prevent anyone making their own an not registering it with IANA.
Google Docs: application/vnd.google-apps.document application/vnd.google-apps.kix Google Presentations: application/vnd.google-apps.presentation Google Spreadsheets: application/vnd.google-apps.spreadsheet Google Drawing: application/vnd.google-apps.drawing See here for more information. Here is a long list of Google Docs and Google Drive MIME types (it is not exhaustive): application/vnd.google-apps.audio application/vnd.google-apps.document application/vnd.google-apps.drawing application/vnd.google-apps.file application/vnd.google-apps.folder application/vnd.google-apps.form application/vnd.google-apps.fusiontable application/vnd.google-apps.kix application/vnd.google-apps.photo application/vnd.google-apps.presentation application/vnd.google-apps.script application/vnd.google-apps.sites application/vnd.google-apps.spreadsheet application/vnd.google-apps.unknown application/vnd.google-apps.video