Fileinfo Functions

XXXVII. Fileinfo Functions



This extension is EXPERIMENTAL. The behaviour of this extension -- including the names of its functions and anything else documented about this extension -- may change without notice in a future release of PHP. Use this extension at your own risk.

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.


A short installation note: just type
$ pear install fileinfo
in your console.

Runtime Configuration

This extension has no configuration directives defined in php.ini.

Resource Types

There is one resource used in Fileinfo extension: a magic database descriptor returned by finfo_open().

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.


No special handling.


Follow symlinks.


Return a mime string, instead of a textual description.


Decompress compressed files.


Look at the contents of blocks or character special devices.


Return all matches, not just the first.


If possible preserve the original access time.

FILEINFO_RAW (integer)

Don't translate unprintable characters to a \ooo octal representation.

Table of Contents
finfo_buffer -- Return information about a string buffer
finfo_close -- Close fileinfo resource
finfo_file -- Return information about a file
finfo_open -- Create a new fileinfo resource
finfo_set_flags -- Set libmagic configuration options
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