LVII. Mimetype Functions

介绍

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

无需外部库文件就可以加入本扩展模块的支持。

安装

You must compile PHP with the configure switch --with-mime-magic to get support for mime-type functions. The extension needs a copy of the simplified magic file that is distributed with the Apache httpd.

注: The configure option has been changed from --enable-mime-magic to --with-mime-magic since PHP 4.3.2

注: This extension is not capable of handling the fully decorated magic file that generally comes with standard Linux distro's and is supposed to be used with recent versions of file command.

运行时配置

这些函数的行为受到全局配置文件 php.ini 的影响。

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().

资源类型

该扩展模块未定义任何资源类型。

预定义常量

该扩展模块未定义任何常量。

目录
mime_content_type -- Detect MIME Content-type for a file