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LVII. Mimetype Functions


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.


No external libraries are needed to build this extension.


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.

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.

Table of Contents
mime_content_type -- Detect MIME Content-type for a file