check if a files mime-type matches it's extension in php

Question

Is there any way to check that a files mime-type matches it's extension in php ?

Thanks, Adam

Answer 1

See here: http://www.php.net/manual/en/function.finfo-file.php . This function allows you to detect the file's mime-type.

Answer 2

If you have a list of known mime types with corresponding extensions, using the mime_content_type function and looking up the extension in an array is simple. There are problems, however; a comprehensive list would be large and likely become outdated fairly quickly, and sniffing mime types is generally considered a difficult problem with inaccurate solutions .