Introduction
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.
Requirements
No external libraries are needed to build this extension.
Installation
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.
Runtime Configuration
The behaviour of these functions is affected by settings in php.ini.
Table 1. Mimetype configuration options
| Name | Default | Changeable |
|---|
| mime_magic.magicfile | "/usr/share/misc/magic.mime" | PHP_INI_SYSTEM |
For further details and definition of the PHP_INI_* constants see
ini_set().
Resource Types
This extension has no resource types defined.
Predefined Constants
This extension has no constants defined.
