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finfo_open

finfo->__construct

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

finfo_open -- finfo->__constructCreate a new fileinfo resource

Description

Procedural style

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

Oriented object style (constructor):

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

This function opens a magic database and returns its resource.

Parameters

options

One or disjunction of more Fileinfo constants.

magic_file

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.

Return Values

Returns a magic database resource on success or FALSE on failure.

Examples

Example #1 Object oriented style

<?php
$finfo 
= new finfo(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 
$finfo->file($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

See Also

add a note add a note

User Contributed Notes 10 notes

up
6
illusivefingers at gmail dot com
2 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
3
mark at dynom dot nl
5 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
2
olivier dot berger at it-sudparis dot eu
3 years ago
On my Debian squeeze system, the path needed is like :
<?php
$finfo
= new finfo(FILEINFO_MIME, "/usr/share/misc/magic.mgc");
?>
up
2
ian at createanet dot co dot uk
6 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
Anonymous
1 year 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
0
franssen dot roland at gmail dot com
4 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
up
0
php at brudaswen dot de
6 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
dario dot borreguero at gmail dot com
6 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
0
php at kingsquare dot nl
6 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
tularis at php dot net
7 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 \!
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