What kind of file types does PHP getimagesize() return?

Question

Does anyone know all the possible results for the 3rd value returned from PHP's getimagesize() function? Example this code below will return:

• $imageinfo['2'] = 2; for a jpg image,
• $imageinfo['2'] = 3; for a png image,
• $imageinfo['2'] = 0; for a gif image.

The numbers might not be correct above but you get the idea.

I can't find on php.net or anywhere else a list of all possible results for the 3rd value.

$imageinfo = getimagesize($imageurl);
$image_type  = $imageinfo['2'];

Answer 1

Execute this:

print_r(get_defined_constants());

And then look for constants prefixed with IMAGETYPE_. On my PHP 5.3 installation I got these values:

[IMAGETYPE_GIF] => 1
[IMAGETYPE_JPEG] => 2
[IMAGETYPE_PNG] => 3
[IMAGETYPE_SWF] => 4
[IMAGETYPE_PSD] => 5
[IMAGETYPE_BMP] => 6
[IMAGETYPE_TIFF_II] => 7
[IMAGETYPE_TIFF_MM] => 8
[IMAGETYPE_JPC] => 9
[IMAGETYPE_JP2] => 10
[IMAGETYPE_JPX] => 11
[IMAGETYPE_JB2] => 12
[IMAGETYPE_SWC] => 13
[IMAGETYPE_IFF] => 14
[IMAGETYPE_WBMP] => 15
[IMAGETYPE_JPEG2000] => 9
[IMAGETYPE_XBM] => 16
[IMAGETYPE_ICO] => 17
[IMAGETYPE_UNKNOWN] => 0
[IMAGETYPE_COUNT] => 18

As you can see Flash SWF are considered images, and actually getimagesize() is able to read the width and height of a SWF object. To me it seemed like a curiosity when I first discovered it, that's why mentioned it here.