问题
I have local access to files, which I need to get their MIME types. Working in WAMP/LAMP, CodeIgniter, and Zend libraries. What's the best way to get MIME type information?
回答1:
There's no easy way. You could try:
http://www.php.net/manual/en/function.finfo-file.php
// return mime type ala mimetype extension
$finfo = finfo_open(FILEINFO_MIME_TYPE);
Of course, this assumes you can install PECL extensions.
回答2:
I think you need head. Quickest way is to do a head request, or in PHP under apache you can use apache_lookup_uri or in PHP 5.3 you can use FileInfo (I'd still recommend apache_lookup_uri or a simple head request though).
回答3:
Its never a good idea to try and find the mime type based on the file extension, as this can obviously be renamed by the used whos uploading - from .exe to .jpg
Real mime type detection is part of your overall security measures.
回答4:
Parse your Apache's mime.types file.
回答5:
Try CI's built in function "get_mime_by_extension($file)". You can find it in the "system/helpers/file_helper.php" file
来源：https://stackoverflow.com/questions/3191579/get-mime-type-via-php