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.