Note: This manual is provided for your convenience only - this is not the official source and may not be 100% up to date.

Fileinfo Functions

XXXVIII. Fileinfo 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.


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:

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