LVII. Mimetype Functions

介紹

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.

需求

建立這個延伸不需要任何外部程式庫。

安裝

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.

執行時期組態

php.ini中的設定會影響這些函數的行為。

表格 1. Mimetype configuration options

NameDefaultChangeable
mime_magic.magicfile"/usr/share/misc/magic.mime"PHP_INI_SYSTEM
For further details and definition of the PHP_INI_* constants see ini_set().

資源類型

這個延伸沒有定義任何資源。

預先定義常數

這個延伸沒有定義任何常數。

內容目錄
mime_content_type -- Detect MIME Content-type for a file