finfo_open
finfo->__construct()
(No version information available, might be only in CVS)
finfo->__construct() — Create a new fileinfo resource
Описание
Procedural style
Object oriented style (constructor):
This function opens a magic database and returns its resource.
Список параметров
- 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.
Возвращаемые значения
Returns a magic database resource on success or FALSE on failure.
Примеры
Пример #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);
/* close connection */
$finfo->close();
?>
Пример #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);
?>
Результат выполнения данного примера:
text/plain
Коментарии
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 \!
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
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);
?>
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.
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.
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."
On my Debian squeeze system, the path needed is like :<?php
$finfo = new finfo(FILEINFO_MIME, "/usr/share/misc/magic.mgc");
?>
I am running Windows 7 with Apache. It took hours to figure out why it was not working.
First, enable the php_fileinfo.dll extension in you php.ini. You'll also need the four magic files that are found in the following library:
http://sourceforge.net/projects/gnuwin32/files/file/4.23/file-4.23-bin.zip/download
An environment variable or a direct path to the file named "magic" is necessary, without any extension.
Then, make sure that xdebug is either turned off or set the ini error_reporting to not display notices or warnings for the script.
Hope this saves someone a few hours of frustration!
For most common image files:<?php
function minimime($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;
}
?>