LVIII. 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 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.
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.
这些函数的行为受到全局配置文件 php.ini 的影响。
For further details and definition of the PHP_INI_* constants see ini_set().
表格 1. Mimetype configuration options