使用Fileinfo在PHP中检测WebM MIME类型

Question

My code use the FileInfo extension to detect file mime-type.

$finfo = new finfo();
$mimetype = $finfo->file($filename, FILEINFO_MIME);

This works well for most files I tested. However, it doesn't works for WebM file. I understand that FileInfo uses a magic file database. The same than the one used by the file command which is also unable to detect WebM mime type (on the same system).

I guess it should be possible to add WebM support to this magic file , but how?

Answer 1

这是文件格式的正式定义： http : //www.optimasc.com/products/fileid/magic-format.pdf