On 4/28/07, Tim <downloadsoft@xxxxxxx> wrote:
On 21.04.2007 12:45, Alain Roger wrote:
> Hi,
>
> In my web application, end user is able to load images (png, jpeg,
> gif,..) into database. I would like to know how can i detect
> automatically the type of image (pnd, jpeg,...) ? i do not want to
> check the extension because this is easily faked... just by renaming
> it.
>
> Does it exist a technique for that ?
>
> thanks a lot,
>
Hi,
unfortunately mime_content_type() does not work for me. This functions
does always return false, although the "magic.mime" is valid.
Here is a function I wrote to determine the correct extension of an
image file:
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;
}
Best regards,
Tim
First of all, i don't see any reason why this works better then other
functions, as it also relies on the magic bytes.
Second, for your switch, you should use the constants
(IMAGETYPE_GIF,IMAGETYPE_JPEG,...) instead of just using decimal
values.
Tijnema
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