Mimetype Functions

简介

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 derived from Apache mod_mime_magic, which is itself based on the file command maintained by Ian F. Darwin. See the source code for further historic and copyright information.

需求

要编译本扩展模块无需外部库文件。

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.

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

Note: 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.

Note: Note to Win32 Users In order to use this module on a Windows environment, you must set the path to the bundled magic.mime file in your php.ini.

Example#1 Setting the path to magic.mime

mime_magic.magicfile = "$PHP_INSTALL_DIR\magic.mime"

Remember to substitute the $PHP_INSTALL_DIR for your actual path to PHP in the above example. e.g. c:\php

运行时配置

这些函数的行为受 php.ini 的影响。

Mimetype configuration options

Name	Default	Changeable	Changelog
mime_magic.debug	"0"	PHP_INI_SYSTEM	Available since PHP 5.0.0.
mime_magic.magicfile	"/path/to/php/magic.mime"	PHP_INI_SYSTEM	Available since PHP 4.3.0.

有关 PHP_INI_* 常量进一步的细节与定义参见php.ini 配置选项。

以下是配置选项的简要解释。

mime_magic.debug bool

Enable/disable debugging.

mime_magic.magicfile string

The path to the magic.mime file.

资源类型

本扩展模块未定义任何资源类型。

预定义常量

本扩展模块未定义任何常量。