finfo_close
While figuring out my problem using this new function, i had a brainwave in using the full path of the file instead of the relative path. For example:
<?php
$folder = "somefolder/";
$fileName "aFile.pdf";
$finfo = finfo_open(FILEINFO_MIME_TYPE);
finfo_file($finfo, $folder.$fileName);
?>
This will result in an error where it can't find the file specified.
This however fixxes that problem:
<?php
$folder = "somefolder/";
$fileName "aFile.pdf";
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime = finfo_file($finfo, dirname(__FILE__)."/".$folder.$fileName);
?>
finfo_file
(PHP >= 5.3.0, PECL fileinfo >= 0.1.0)
finfo_file — Devuelve información sobre un fichero
Descripción
Estilo por procesos
string finfo_file
( resource $finfo
, string $file_name = NULL
[, int $options = FILEINFO_NONE
[, resource $context = NULL
]] )
Estilo orientado a objetos
string finfo::file
( string $file_name = NULL
[, int $options = FILEINFO_NONE
[, resource $context = NULL
]] )
Esta función se usa para obtener información de un fichero.
Parámetros
- finfo
-
Devuelve recurso Fileinfo por finfo_open().
- file_name
-
Nombre del fichero a ser comprobado.
- options
-
Una o más constantes Fileinfo .
- context
-
Para una descripción de contexts, dirígase a Funciones de Flujos.
Valores devueltos
Devuelve una descripción de texto del contenido del argumento filename, o FALSE en caso de error.
Ejemplos
Example #1 Un ejemplo de finfo_file()
<?php
$finfo = finfo_open(FILEINFO_MIME_TYPE); // devuelve el tipo mime de su extensión
foreach (glob("*") as $filename) {
echo finfo_file($finfo, $filename) . "\n";
}
finfo_close($finfo);
?>
El resultado del ejemplo sería algo similar a:
text/html image/gif application/vnd.ms-excel
add a note
User Contributed Notes
finfo_file
info at tech dash bits dot net
13-Feb-2011 09:34
scott at thebrain dot ca
07-Jan-2009 05:29
I thought to use fileinfo to check if a file was gzip or bzip2. However, the mime type of a compressed file is "data" because compression is an encoding rather than a type.
gzip files begin with binary 1f8b.
bzip2 files begin with magic bytes 'B' 'Z' 'h'.
e.g.
<?php
$s = file_get_contents("somefilepath");
if ( bin2hex(substr($s,0,2)) == '1f8b' ) {/* could be a gzip file */}
if( substr($s,0,3) == 'BZh' ){/* could be a bzip2 file */}
?>
I am not an encoding expert. My only testing was using a few of my own encoded files.
darko at uvcms dot com
01-Aug-2008 03:28
OO (bit improved) version of the same thing
<?php
$file = '<somefile>';
$ftype = 'application/octet-stream';
$finfo = @new finfo(FILEINFO_MIME);
$fres = @$finfo->file($file);
if (is_string($fres) && !empty($fres)) {
$ftype = $fres;
}
?>
darko at uvcms dot com
24-Apr-2008 04:53
Another interresting feature of finfo_file on Windows.
This function can return empty string instead of FALSE for some file types (ppt for example). Therefore to be sure do a triple check of output result and provide default type just in case. Here is a sample code:
$ftype = 'application/octet-stream';
$finfo = @finfo_open(FILEINFO_MIME);
if ($finfo !== FALSE) {
$fres = @finfo_file($finfo, $file);
if ( ($fres !== FALSE)
&& is_string($fres)
&& (strlen($fres)>0)) {
$ftype = $fres;
}
@finfo_close($finfo);
}
WebShowPro
25-Sep-2007 09:01
Just an improvement on the sample Ryan Day posted - slightly off topic since this method does not use finfo_file but in some cases this method might be preferable.
The main change is the -format %m parameters given to the identify call. I would suggest using the full system path to identify i.e. /usr/bin/identify to be a little safer (the location may change from server to server though).
<?php
function is_jpg($fullpathtoimage){
if(file_exists($fullpathtoimage)){
exec("/usr/bin/identify -format %m $fullpathtoimage",$out);
//using system() echos STDOUT automatically
if(!empty($out)){
//identify returns an empty result to php
//if the file is not an image
if($out == 'JPEG'){
return true;
}
}
}
return false;
}
?>
Ryan Day
31-Aug-2007 09:34
to check images on unix based systems its much better to use the identify command provided by image magic as it provides accurate results about all files
<?php
function is_jpg($fullpathtoimage){
if(file_exists($fullpathtoimage)){
exec("identify $fullpathtoimage",$out);
//using system() echos STDOUT automatically
if(!empty($out)){
//identify returns an empty result to php
//if the file is not an image
$info = $out[0];
$info = explode(' ',$out[0]);
//^IF THE FILENAME CONTAINS SPACES
//^THIS WILL NOT WORK...be creative
$type = $info[1];
if($type == 'JPEG'){
return true;
}
}
}
return false;
}
?>
identify can process all types of images that are web friendly
sample output:
./image/someimage.jpg JPEG 150x112 150x112+0+0 DirectClass 8-bit 4.54688kb
if you dont want to control the image name or want to support spaces use: escapeshellarg()
http://us2.php.net/manual/en/function.escapeshellarg.php
function links:
exec() -- http://us2.php.net/manual/en/function.exec.php
explode() -- http://us2.php.net/manual/en/function.explode.php
Schraalhans Keukenmeester
21-May-2007 10:20
Tempting as it may seem to use finfo_file() to validate uploaded image files (Check whether a supposed imagefile really contains an image), the results cannot be trusted. It's not that hard to wrap harmful executable code in a file identified as a GIF for instance.
A better & safer option is to check the result of:
if (!$img = @imagecreatefromgif($uploadedfilename)) {
trigger_error('Not a GIF image!',E_USER_WARNING);
// do necessary stuff
}