Mimetype
Lukas V is IMO missing some point. The MIME type of a file may not be corresponding to the file suffix.
Imagine someone would obfuscate some PHP code in a .gif file, the file suffix would be 'GIF' but the MIME would be text/plain or even text/html.
Another example is files fetched via a distant server (wget / fopen / file / fsockopen...). The server can issue an error, i.e. 404 Not Found, wich again is text/html, whatever you save the file to (download_archive.rar).
His provided function should begin by the test of the function existancy like :
function MIMEalternative($file)
{
if(function_exists('mime_content_type'))
return mime_content_type($file);
else
return <lukas_v.MIMEfunction>($file);
}
mime_content_type
Description
string mime_content_type ( string filename)Returns the MIME content type for a file as determined by using information from the magic.mime file. Content types are returned in MIME format, like text/plain or application/octet-stream.
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User Contributed Notesmime_content_type
geompse
22-Sep-2008 11:46
22-Sep-2008 11:46
Curtiss
19-Sep-2008 06:25
19-Sep-2008 06:25
I'm not sure if anyone is still using the functions shown below (I'm guessing someone must still be, since the latest update to the functions was made a few months ago), but I think you'd be better off using an explode statement rather than the regex shown in most of the functions to find the filesuffix.
The regex shown is only going to catch files with extensions between 2 and 4 characters. While filenames with more or less than that are extremely rare, they do exist. If you open the regex up to start accepting those types of things, however, you're making your life complicated for no reason.
In addition, I don't see the need for the overhead produced by the preg_match function when you could just use the explode and array_pop functions together.
If you explode the filename, using the dot as a separator, you can simply pop the last element off of the array to get the real file extension, no matter how short or long it is, without the overhead of a regex (unless one of those functions calls a regex in the background of which I'm not aware).
Therefore, where the regex would return no results on something like:
/var/www/html/example.backup
or
/var/www/html/example-program.c
the explode function would simply split it wherever it finds a dot and you can pop the last one off:
<?php
$filename = '/var/www/html/example.backup';
$finfo = explode('.',$filename);
$fileSuffix = array_pop($finfo);
?>
Then, to put the rest of the file name back together, you can use the implode function on the remainder of the finfo array. Alternatively, when putting the rest of the file name back together, you could use the str_replace function to replace the dot and the extension with nothing, but then you run the rare risk of removing the same string from the middle of the file name somewhere (not very likely, but possible nonetheless).
Also, on a side note, the last function example is going to return the wrong value if the file extension is not in the list and the mime_content_type function exists. Because that part of the function re-sets the $fileSuffix variable, without returning a value, the function is going to move on to the next statement, which is only going to return the first letter of whatever was returned by the mime_content_type function.
Instead of reading:
<?php
if(function_exists("mime_content_type"))
{
$fileSuffix = mime_content_type($filename);
}
?>
it should read:
<?php
if(function_exists("mime_content_type"))
{
return mime_content_type($filename);
}
?>
php [spat] hm2k.org
21-Aug-2008 10:52
21-Aug-2008 10:52
I also had issues with this function.
The issue was that it would almost always return "text/plain".
echo ini_get('mime_magic.magicfile'); // returns /etc/httpd/conf/magic
I found that I needed the OS' magic.mime file instead.
You can either copy it to the existing location, or update your php.ini, you cannot use ini_set().
[root@blade conf]# mv magic magic.old
[root@blade conf]# cp /usr/share/magic.mime magic
[root@blade conf]# apachectl graceful
Note: you will see that I have gracefully restarted apache to ensure it has taken affect.
lukas v
10-Jul-2008 05:57
10-Jul-2008 05:57
I cleaned up and compiled together code from different people here below. This code returns "unknown/<filesuffix>" if it can't something better.
<?php
function returnMIMEType($filename)
{
preg_match("|\.([a-z0-9]{2,4})$|i", $filename, $fileSuffix);
switch(strtolower($fileSuffix[1]))
{
case "js" :
return "application/x-javascript";
case "json" :
return "application/json";
case "jpg" :
case "jpeg" :
case "jpe" :
return "image/jpg";
case "png" :
case "gif" :
case "bmp" :
case "tiff" :
return "image/".strtolower($fileSuffix[1]);
case "css" :
return "text/css";
case "xml" :
return "application/xml";
case "doc" :
case "docx" :
return "application/msword";
case "xls" :
case "xlt" :
case "xlm" :
case "xld" :
case "xla" :
case "xlc" :
case "xlw" :
case "xll" :
return "application/vnd.ms-excel";
case "ppt" :
case "pps" :
return "application/vnd.ms-powerpoint";
case "rtf" :
return "application/rtf";
case "pdf" :
return "application/pdf";
case "html" :
case "htm" :
case "php" :
return "text/html";
case "txt" :
return "text/plain";
case "mpeg" :
case "mpg" :
case "mpe" :
return "video/mpeg";
case "mp3" :
return "audio/mpeg3";
case "wav" :
return "audio/wav";
case "aiff" :
case "aif" :
return "audio/aiff";
case "avi" :
return "video/msvideo";
case "wmv" :
return "video/x-ms-wmv";
case "mov" :
return "video/quicktime";
case "zip" :
return "application/zip";
case "tar" :
return "application/x-tar";
case "swf" :
return "application/x-shockwave-flash";
default :
if(function_exists("mime_content_type"))
{
$fileSuffix = mime_content_type($filename);
}
return "unknown/" . trim($fileSuffix[0], ".");
}
}
?>
MKoper
01-Jul-2008 01:29
01-Jul-2008 01:29
Regarding serkanyersen's example, i extended the extensions list
case "js":
return "application/x-javascript";
case "json":
return "application/json";
case "jpg":
case "jpeg":
case "jpe":
return "image/jpg";
case "png":
case "gif":
case "bmp":
case "tiff":
return "image/".strtolower($matches[1]);
case "css":
return "text/css";
case "xml":
return "application/xml";
case "doc":
case "docx":
return "application/msword";
case "xls":
case "xlt":
case "xlm":
case "xld":
case "xla":
case "xlc":
case "xlw":
case "xll":
return "application/vnd.ms-excel";
case "ppt":
case "pps":
return "application/vnd.ms-powerpoint";
case "rtf":
return "application/rtf";
case "pdf":
return "application/pdf";
case "html":
case "htm":
case "php":
return "text/html";
case "txt":
return "text/plain";
case "mpeg":
case "mpg":
case "mpe"
return "video/mpeg";
case "mp3":
return "audio/mpeg3";
case "wav":
return "audio/wav";
case "aiff":
case "aif":
return "audio/aiff";
case "avi":
return "video/msvideo";
case "wmv":
return "video/x-ms-wmv";
case "mov":
return "video/quicktime";
case "zip":
return "application/zip";
case "tar":
return "application/x-tar";
case "swf":
return "application/x-shockwave-flash";
memi aet liip doet ch
06-Jun-2008 02:59
06-Jun-2008 02:59
Regarding serkanyersen's example : It is advisable to change the regular expression to something more precise like
preg_match("|\.([a-z0-9]{2,4})$|i", $filename, $m);
This makes sure that only the last few characters are taken. The original expression would not work if the filename is a relative path.
serkanyersen
29-Apr-2008 08:22
29-Apr-2008 08:22
I've written an alternative for this. Not necessarily tested but it works OK on my server.
I hope this helps
<?
/**
* Tries to get mime data of the file.
* @return {String} mime-type of the given file
* @param $filename String
*/
function get_mime($filename){
preg_match("/\.(.*?)$/", $filename, $m); # Get File extension for a better match
switch(strtolower($m[1])){
case "js": return "application/javascript";
case "json": return "application/json";
case "jpg": case "jpeg": case "jpe": return "image/jpg";
case "png": case "gif": case "bmp": return "image/".strtolower($m[1]);
case "css": return "text/css";
case "xml": return "application/xml";
case "html": case "htm": case "php": return "text/html";
default:
if(function_exists("mime_content_type")){ # if mime_content_type exists use it.
$m = mime_content_type($filename);
}else if(function_exists("")){ # if Pecl installed use it
$finfo = finfo_open(FILEINFO_MIME);
$m = finfo_file($finfo, $filename);
finfo_close($finfo);
}else{ # if nothing left try shell
if(strstr($_SERVER[HTTP_USER_AGENT], "Windows")){ # Nothing to do on windows
return ""; # Blank mime display most files correctly especially images.
}
if(strstr($_SERVER[HTTP_USER_AGENT], "Macintosh")){ # Correct output on macs
$m = trim(exec('file -b --mime '.escapeshellarg($filename)));
}else{ # Regular unix systems
$m = trim(exec('file -bi '.escapeshellarg($filename)));
}
}
$m = split(";", $m);
return trim($m[0]);
}
}
?>
mami at madagascarsurlenet dot com
13-Nov-2007 10:58
13-Nov-2007 10:58
Since I enabled the mime_magic extension on my IIS, I also got the error message "invalid magic file, disabled" in my phpinfo. After I add these lines to my php.ini, the message disappeared and it works great!
mime_magic.debug = Off
mime_magic.magicfile ="D:\PHP5\extras\magic.mime"
mime_magic.debug is by default off but without this line it fails. I'm using PHP 5.2.5.
Sune Jensen
29-Aug-2007 09:16
29-Aug-2007 09:16
For me mime_content_type didn't work in Linux before I added
mime_magic.magicfile = "/usr/share/magic.mime"
to php.ini (remember to find the correct path to mime.magic)
dt at php dot net
14-Jun-2007 08:18
14-Jun-2007 08:18
<?php
if (!function_exists('mime_content_type ')) {
function mime_content_type($filename) {
$finfo = finfo_open(FILEINFO_MIME);
$mimetype = finfo_file($finfo, $filename);
finfo_close($finfo);
return $mimetype;
}
}
?>
Quis at IHAVEGOTSPAMENOUGH dot omicidio dot nl
12-Feb-2007 09:28
12-Feb-2007 09:28
<?PHP
function qmimetype($file) {
$ext=array_pop(explode('.',$file));
foreach(file('/usr/local/etc/apache22/mime.types') as $line)
if(preg_match('/^([^#]\S+)\s+.*'.$ext.'.*$/',$line,$m))
return $m[1];
return 'application/octet-stream';
}
?>
Not perfect, but works good enough for me ;)
tree2054 using hotmail
03-Nov-2006 05:59
03-Nov-2006 05:59
The correct little correction:
exec will return the mime with a newline at the end, the trim() should be called with the result of exec, not the other way around.
<?php
if ( ! function_exists ( 'mime_content_type ' ) )
{
function mime_content_type ( $f )
{
return trim ( exec ('file -bi ' . escapeshellarg ( $f ) ) ) ;
}
}
?>
15-Oct-2006 07:06
if you use a transparent 'spacer' GIF i've found it needs to be a around 25x25 for it to register as 'image/gif'. otherwise it's read in as 'text/plain'.
webmaster at cafe-clope dot net
23-Feb-2006 05:31
23-Feb-2006 05:31
Completing <some dude AT somewhere DOT com> comment:
0 string < ? php application/x-httpd-php
and string detection on text files may fail if you check a file encoded with signed UTF-8. The UTF-8 signature is a two bytes code (0xFF 0xFE) that prepends the file in order to force UTF-8 recognition (you may check it on an hexadecimal editor).
Y0Gi
25-Jan-2006 11:13
25-Jan-2006 11:13
The 'file' utility fortunately is available for Windows, too:
http://gnuwin32.sourceforge.net/packages/file.htm
some dude AT somewhere DOT com
07-Oct-2005 09:44
07-Oct-2005 09:44
I added these two lines to my magic.mime file:
0 string \<?php application/x-httpd-php
0 string <?xml text/xml
The first one may not work if "<?php" is not at the very beginning of your file, e.g., if some HTML preceeds the first bit of PHP code. The second one should work because "<?xml" *should* be the first thing in every XML file.
ginnsu at arcee dot ca
08-Mar-2005 10:14
08-Mar-2005 10:14
The function mime_content_type only worked for me on Microsoft Windows after I added the directive "mime_magic.debug" to my php.ini with the value of "On". The default value appears to be "Off". Exampe:
[mime_magic]
mime_magic.debug = On
mime_magic.magicfile = "c:\php\extras\magic.mime"