1，phpthumb_ico 是生成ICO图标的类，源码如下
class phpthumb_ico {
function phpthumb_ico() {
return true;
}
function GD2ICOstring(&$gd_image_array) {
foreach ($gd_image_array as $key => $gd_image) {
$ImageWidths[$key] = ImageSX($gd_image);
$ImageHeights[$key] = ImageSY($gd_image);
