The functions in this module try to guess the
content type and encoding of a file by looking for
certain
magic byte sequences at specific positions
within the file. While this is not a bullet proof
approach the heuristics used do a very good job.
This extension is derivated from Apache
mod_mime_magic, which is itself based on the file command maintaind by Ian F.
Darwin. See the source code for further historic and
copyright information.
You must compile PHP with the configure switch --enable-mime-magic to get support
for mime-type functions. The extension needs a copy of
the magic.mime as distributed
with the file command. This
file also part of most recent Linux distributions and
usually stored in the
/usr/share/misc directory.
php.ini中的設定會影響這些函數的行為。
表格 1. Mimetype configuration options