Description:
------------
getimagesize() function will return FALSE when a remote file containing a colon (:) in filename is specified. It can't be handled / opened.

This image is used as example: http://inattack.ru/bar/inattack_bar_2012_2:10_FFFFFF_5_0.jpg

PHP configuration allows remote files.

Reproduce code:
---------------
$res = @getimagesize("http://inattack.ru/bar/inattack_bar_2012_2:10_FFFFFF_5_0.jpg");

if ($res === false) {
echo "Failed to open target image.";
} else {
echo "WxH: ".$res[0]."x".$res[1];
}

Expected result:
----------------
$res should return array with 5 elements, as it does when same image without a colon in filename is specified.

Actual result:
--------------
A FALSE is returned.