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Title : Get the correct extension and MIME types of an image, even when the filename is incorrect.
Categories : PHP, Filesystem, General SQL Click here to Update Your Picture
isaac mugisha
Date : Apr 28th 2007
Grade : 5 of 5 (graded 2 times)
Viewed : 7549
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This function determines the correct extension of an image file. Getting types by the file extension is rather insecure, because it can be easily faked.
As an alternative, you can use mime_content_type() to detect the MIME type, even when the file is not an image.

<?php
function get_image_extension($filename)
{
     if (
function_exists('exif_imagetype'))
     {
         switch (
exif_imagetype($filename))
         {
             case
1:
                 return
'gif';
             case
2:
                 return
'jpg';
             case
3:
                 return
'png';
             case
4:
                 return
'swf';
             case
5:
                 return
'psd';
             case
6:
                 return
'bmp';
             case
7:
                 return
'tiff';
             case
8:
                 return
'tiff';
             case
9:
                 return
'jpc';
             case
10:
                 return
'jp2';
             case
11:
                 return
'jpx';
             case
12:
                 return
'jb2';
             case
13:
                 return
'swc';
             case
14:
                 return
'iff';
             case
15:
                 return
'wbmp';
             case
16:
                 return
'xbm';
             default:
                 return
false;
         }
     }
     else
         return
false;
}
?>



If mime_content_type does not work for you, you can use this workaround:
taken from http://www.weberdev.com/mime-content-type
tree2054 using hotmail
04-Nov-2006 02:59
<?php
if ( ! function_exists ( 'mime_content_type ' ) )
{
   function
mime_content_type ( $f )
   {
       return
trim ( exec ('file -bi ' . escapeshellarg ( $f ) ) ) ;
   }
}
?>


This workaround is for Linux users. If you use Windows, you have to install this application:
http://gnuwin32.sourceforge.net/packages/file.htm



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