水印为什么无法实现啊
Public function shuiyin($source, $water, $savename=null, $alpha=80){

import('ORG.Util.Image');
$Image = new Image();
// 给avator.jpg 图片添加logo水印
//water($source, $water, $savename=null, $alpha=80)
//$Image->water('/avator.jpg','/logo.jpg');
$Image->water($source, $water, $savename, $alpha);

}