PHP 8.3.4 Released!

finfo_open

finfo::__construct

(PHP >= 5.3.0, PHP 7, PHP 8, PECL fileinfo >= 0.1.0)

finfo_open -- finfo::__constructCreate a new finfo instance

Description

Procedural style

finfo_open(int $flags = FILEINFO_NONE, ?string $magic_database = null): finfo|false

Object-oriented style (constructor):

public finfo::__construct(int $flags = FILEINFO_NONE, ?string $magic_database = null)

This function opens a magic database and returns its instance.

Parameters

flags

One or disjunction of more Fileinfo constants.

magic_database

Name of a magic database file, usually something like /path/to/magic.mime. If not specified, the MAGIC environment variable is used. If the environment variable isn't set, then PHP's bundled magic database will be used.

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

Return Values

(Procedural style only) Returns an finfo instance on success, or false on failure.

Changelog

Version Description
8.1.0 Returns an finfo instance now; previously, a resource was returned.
8.0.3 magic_database is nullable now.

Examples

Example #1 Object-oriented style

<?php
$finfo
= new finfo(FILEINFO_MIME, "/usr/share/misc/magic"); // return mime type ala mimetype extension

/* get mime-type for a specific file */
$filename = "/usr/local/something.txt";
echo
$finfo->file($filename);

?>

Example #2 Procedural style

<?php
$finfo
= finfo_open(FILEINFO_MIME, "/usr/share/misc/magic"); // return mime type ala mimetype extension

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

/* get mime-type for a specific file */
$filename = "/usr/local/something.txt";
echo
finfo_file($finfo, $filename);

/* close connection */
finfo_close($finfo);
?>

The above example will output:

text/plain; charset=us-ascii

Notes

Note:

Generally, using the bundled magic database (by leaving magic_database and the MAGIC environment variables unset) is the best course of action unless you specifically need a custom magic database.

See Also

add a note

User Contributed Notes 10 notes

up
3
dario dot borreguero at gmail dot com
15 years ago
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:
c:\php\magic.mime
c:\php\magic

2. PHP Code:
<?php
$filname
= 'c:\php\php.ini';
$finfo = new finfo(FILEINFO_MIME, 'c:\php\magic');
if (!
$finfo) return false;
echo
$finfo->file($filename);
?>

For further info see: http://pecl.php.net/bugs/bug.php?id=7555

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.
up
19
illusivefingers at gmail dot com
12 years ago
I am running Windows 7 with Apache. It took hours to figure out why it was not working.

First, enable the php_fileinfo.dll extension in you php.ini. You'll also need the four magic files that are found in the following library:

http://sourceforge.net/projects/gnuwin32/files/file/4.23/file-4.23-bin.zip/download

An environment variable or a direct path to the file named "magic" is necessary, without any extension.

Then, make sure that xdebug is either turned off or set the ini error_reporting to not display notices or warnings for the script.

Hope this saves someone a few hours of frustration!
up
8
Anonymous
10 years ago
For most common image files:
<?php
function minimime($fname) {
$fh=fopen($fname,'rb');
if (
$fh) {
$bytes6=fread($fh,6);
fclose($fh);
if (
$bytes6===false) return false;
if (
substr($bytes6,0,3)=="\xff\xd8\xff") return 'image/jpeg';
if (
$bytes6=="\x89PNG\x0d\x0a") return 'image/png';
if (
$bytes6=="GIF87a" || $bytes6=="GIF89a") return 'image/gif';
return
'application/octet-stream';
}
return
false;
}
?>
up
1
olivier dot berger at it-sudparis dot eu
13 years ago
On my Debian squeeze system, the path needed is like :
<?php
$finfo
= new finfo(FILEINFO_MIME, "/usr/share/misc/magic.mgc");
?>
up
0
php at brudaswen dot de
15 years ago
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.
up
0
php at kingsquare dot nl
16 years ago
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:
<?php
$file
= "/path/to/file.jpg";
$handle = finfo_open(FILEINFO_MIME, '/usr/share/file/magic');
$mime_type = finfo_file($handle,$file);
?>
up
0
ian at createanet dot co dot uk
16 years ago
Couldn't get finfo to return the mimetype in the way expected so i made a function to do it with system()

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

hope it works for other people too
up
-1
mark at dynom dot nl
15 years ago
It seems there is quite some inconsistency in distributions and loading of magic files.

On Archlinux, the file is located here:
/usr/share/misc/file/magic.mgc

But this:

<?php
$fi
= new finfo(FILEINFO_MIME, '/usr/share/misc/file/magic');
$fi->file('/tmp/fubar.txt');
?>

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

<?php
$fi
= new finfo(FILEINFO_MIME, '/usr/share/misc/file/magic.mgc'); // added ".mgc"
$fi->file('/tmp/fubar.txt');
?>

It works as expected, so I guess something goes wrong with "A .mime and/or .mgc suffix is added if needed."
up
-4
tularis at php dot net
16 years ago
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 <http://sourceforge.net/projects/gnuwin32/>
2. You can manually "fix" the mime-magic file by editing it and escaping all lines starting with !, thus changing each one to \!
up
-8
franssen dot roland at gmail dot com
13 years ago
Notice FileInfo::__construct() has strange behavior in PHP < 5.3.1 when a 2nd parameter is set explicitly, e.g.;

<?php
$fileInfo
= 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) { }

See http://bugs.php.net/bug.php?id=51732
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