Actually for RPM users file-devel contains whatever libmagic contains. then apart from pear, u can directly use "pecl install Fileinfo".
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.
A short installation note: just type
$ pear install fileinfo
Данное расширение не определяет никакие директивы конфигурации в php.ini.
There is one resource used in Fileinfo extension: a magic database descriptor returned by finfo_open().
Перечисленные ниже константы определены данным расширением и могут быть доступны только в том случае, если PHP был собран с поддержкой этого расширения или же в том случае, если данное расширение подгружается во время выполнения.
- FILEINFO_NONE (integer)
No special handling.
- FILEINFO_SYMLINK (integer)
- FILEINFO_MIME (integer)
Return a mime string, instead of a textual description.
- FILEINFO_COMPRESS (integer)
Decompress compressed files.
- FILEINFO_DEVICES (integer)
Look at the contents of blocks or character special devices.
- FILEINFO_CONTINUE (integer)
Return all matches, not just the first.
- FILEINFO_PRESERVE_ATIME (integer)
If possible preserve the original access time.
- FILEINFO_RAW (integer)
Don't translate unprintable characters to a \ooo octal representation.
If, like I was, you are looking for a quick and easy way to grab a mime type on a file, and don't feel like fiddling around with extentions or pear or any of that, a unix native 'file -i' command will usually do the trick - that is, if you are able to use shell commands.
Be careful of using system("file -i -b file.pdf");
I got some strange results as follows:-
$type=system("file -i -b mime.php");
$type=system("file -i -b mime.php");
 => text/plain
 => charset=us-ascii
$type=@system("file -i -b mime.php");
//echo $type."<br/>\n"; // just comment this line
 => text/x-c++
 => charset=us-ascii
PHP Warning: finfo::finfo(): Failed to load magic database at '/etc/magic'
PHP Warning: finfo::file(): The invalid fileinfo object
These errors can be rectified by copying your magic database (depending on your distro, this file can be anywhere, on debian it's in /usr/share/file/magic) to /etc/magic.mime
libmagic automatically appends the .mime to the end of the filename, so PHP incorrectly reports the path it was looking for.
The same applies for:
PHP Warning: finfo::finfo(): Failed to load magic database at '/etc/magic.mime'
Unfortunately users will have to call the magic file /etc/magic.mime.mime in this case.
Well, it is hard to install and use this extension. There is better alternative - use lunux comand "file". For insturctions - "man file" from linux shell.
echo system("file -i -b file.pdf");
I am about to write how installed this package.
First of all, I tried with "pear install fileinfo" - as the manual says.
But the pear command said that 'Package "Fileinfo" is not valid,
Then the "pear install pecl/fileinfo" was a better way. But at that time the "phpize" command was missing.
I installed that (on openSUSE distributions it is in the php5-devel, but I think you can find it in your distro's corresponding php-devel package).
After that you may install "re2c" (I did). It's homepage is: http://sourceforge.net/projects/re2c
Copy the magic file of Apache (usually in /etc/apache2) into the following directory: /usr/locale/share/file/ or /usr/share/file/
Then you have to install "libmagic-dev". If you have Debian based system you can simply install it with apt.
But if you have an rpm based system (like me), you have to download the following package: http://packages.debian.org/unstable/libdevel/libmagic-dev
It contains the files we need.
So, download the file, browse it with Midnight Commander (mc) (you have to apt and dpkg be installed) and simply extract (so copy) the /usr folder (it is inside the CONTENTS folder) of the .deb package to the root folder.
And now give the "pear install pecl/fileinfo" command another try :)
Ps: Don't forget to check whether the script has wrote the following line into the php.ini (on openSUSE: /etc/php5/apache2): extension=fileinfo.so
I hope, I could help.
I had a real headache trying to install this package through pear/pecl. Ran into what looks like this bug: http://pecl.php.net/bugs/bug.php?id=7673 (phpize fails)
I found downloading the package manually and running ./configure helped show what the problem is:
checking for fileinfo support... yes, shared
checking for magic files in default path... not found
configure: error: Please reinstall the libmagic distribution
I though this was because of a missing magic-database like magic.mime but examining the configure-script, magic.h is searched for.
Problem for me was that include/magic.h was not found. After some googling about where to find magic.h led me to the dead
apt-get install libmagic-dev
This does NOT solve the original installation bug strangely enough, but allows for manual installation:
1. Find the url to the latest version of fileinfo from http://pecl.php.net/package/Fileinfo (atm: http://pecl.php.net/get/Fileinfo-1.0.4.tgz)
2. Download, compile and install
tar -xvf Fileinfo-1.0.4.tar
3. Add extension=fileinfo.so in your php.ini file
4. Restart Apache
For Windows users:
1. Go to http://pecl4win.php.net/ to get the php_fileinfo.dll if your PHP installation didn't come with it, and you haven't installed the Extensions package.
2. Then make sure you have extension=php_fileinfo.dll somewhere in your php.ini
3. Restart your web server.
Sometime "pear install fileinfo" won't work....
so you can try "pear install pecl/fileinfo"