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.
magic_open library is needed to build this extension.
Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: » http://pecl.php.net/package/fileinfo
php.ini中沒有定義此延伸的組態指令。
There is one resource used in Fileinfo extension: a magic database descriptor returned by finfo_open().
以下的常數由此延伸定義,只在這個延伸被編譯成PHP或實行時期被動態載入時有效。