func-mimetype
Mimetype helper functions
Usage
$file = 'test.html';
$mimetype = system_extension_mime_type($file); //returns text/html
$ext = system_mime_type_extension('text/html'); //returns .html
Reference
(string) system_extension_mime_type($file)
Returns the mime type purely by file extension
(string) system_mime_type_extension($mimetype)
Returns the file extension assoicated with the mime type