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Fileinfo Funktionen





(PHP >= 5.3.0, PECL fileinfo >= 0.1.0)

finfo_open -- finfo->__constructCreate a new fileinfo resource


Prozeduraler Stil

resource finfo_open ([ int $options = FILEINFO_NONE [, string $magic_file = NULL ]] )

Objektorientierter Stil (constructor):

finfo::__construct ([ int $options = FILEINFO_NONE [, string $magic_file = NULL ]] )

This function opens a magic database and returns its resource.



One or disjunction of more Fileinfo constants.


Name of a magic database file, usually something like /path/to/magic.mime. If not specified, the MAGIC environment variable is used. If this variable is not set either, /usr/share/misc/magic is used by default. A .mime and/or .mgc suffix is added if needed.

Passing NULL or an empty string will be equivalent to the default value.


Returns a magic database resource on successIm Fehlerfall wird FALSE zurückgegeben..


Beispiel #1 Object oriented style

= new finfo(FILEINFO_MIME"/usr/share/misc/magic"); // return mime type ala mimetype extension

if (!$finfo) {
"Opening fileinfo database failed";

/* get mime-type for a specific file */
$filename "/usr/local/something.txt";


Beispiel #2 Procedural style

finfo_open(FILEINFO_MIME"/usr/share/misc/magic"); // return mime type ala mimetype extension

if (!$finfo) {
"Opening fileinfo database failed";

/* get mime-type for a specific file */
$filename "/usr/local/something.txt";

/* close connection */

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

text/plain; charset=us-ascii

Siehe auch

7 BenutzerBeiträge:
- Beiträge aktualisieren...
franssen dot roland at gmail dot com
11.05.2010 9:23
Notice FileInfo::__construct() has strange behavior in PHP < 5.3.1 when a 2nd parameter is set explicitly, e.g.;

= new finfo(FILEINFO_MIME, null);

Expected result:
object(finfo)#2 (0) { }

Actual result:
Warning: finfo::finfo(): Failed to load magic database at ''. in *** on line ***
object(finfo)#2 (0) { }

mark at dynom dot nl
9.11.2008 21:34
It seems there is quite some inconsistency in distributions and loading of magic files.

On Archlinux, the file is located here:

But this:

= new finfo(FILEINFO_MIME, '/usr/share/misc/file/magic');

Actually segfaults, where if I type the full name (including the file extension:)

= new finfo(FILEINFO_MIME, '/usr/share/misc/file/magic.mgc'); // added ".mgc"

It works as expected, so I guess something goes wrong with "A .mime and/or .mgc suffix is added if needed."
php at brudaswen dot de
15.09.2008 12:13
Since it costed me some time to find the needed magic database files for Windows, just a hint:

The last release of the GnuWin32 project with both needed files (magic and magic.mime) currently was "file-4.23".
All releases after 4.23 to 4.25-1 did not contain both needed files.

Hope that helps.
dario dot borreguero at gmail dot com
16.04.2008 12:15
Platform: WinXP-SP2, PHP5.2.5, MySQL 5.0, Apache 2.2.8

After reading former notes, I wasn't able to load my magic database: 'magic.mime' file (donwloaded from GnuWin32 project, zipped with the binary files v4.21). I always got an invalid $finfo object or finfo_open(...) returned FALSE.

In order to be able to load the 'magic.mime' file, Fileinfo library (bundled in PHP5.2.5) also requires 'magic' file.

For example:
1. Database:

2. PHP Code:
= 'c:\php\php.ini';
$finfo = new finfo(FILEINFO_MIME, 'c:\php\magic');
  if (!
$finfo) return false;

For further info see:

Pay attention to comments added by 'christophe dot charron dot xul at gmail dot com'

NOTE: Before upgrading to PHP5.2.5, I was working with PHP5.2.1 and it only required 'magic.mime' file.
php at kingsquare dot nl
23.01.2008 16:41
The current version (1.04) doesnt support a different mime.magic database than the server default.

(the documentation is thus not correct)
Ubuntu default location is '/usr/share/file/magic'. In order for the examples to work all finfo_open()-commands must be issued with the extra location accordingly:
= "/path/to/file.jpg";
$handle = finfo_open(FILEINFO_MIME, '/usr/share/file/magic');
$mime_type = finfo_file($handle,$file);
ian at createanet dot co dot uk
2.11.2007 17:50
Couldn't get finfo to return the mimetype in the way expected so i made a function to do it with system()

function get_mime_type($filepath) {
system("file -i -b {$filepath}");
$output = ob_get_clean();
$output = explode("; ",$output);
    if (
is_array($output) ) {
$output = $output[0];

hope it works for other people too
tularis at php dot net
6.05.2007 21:55
On Windows systems people might find that this always returns "application/x-dpkg".
There are 2 ways of solving this problem:
1. Get the mime-magic database file from GnuWin32 at <>
2. You can manually "fix" the mime-magic file by editing it and escaping all lines starting with !, thus changing each one to \!

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