PHPCMS实现上传图片同时自动生成不同大小的缩略图

//手机游戏平台站点上传缩略图，自动生成75X75，48X48的缩略图
$siteid=$this->siteid;//获取当前站点siteid
if ($siteid==3) {
 $rawpic=isset($_POST['info']['thumb'])?$_POST['info']['thumb']:'';
 //如果上传了第一张缩略图
 if ($rawpic) {
  $new75_75=thumb($rawpic,75,75);
  $new48_48=thumb($rawpic,48,48);
 }
 $_POST['info']['thumb2']=$new75_75;
 $_POST['info']['thumb3']=$new48_48;
}

function thumb($imgurl, $width = 100, $height = 100 ,$autocut = 1, $smallpic = 'nopic.gif') {
 global $image;
 $upload_url = pc_base::load_config('system','upload_url');
 $upload_path = pc_base::load_config('system','upload_path');
 if(empty($imgurl)) return IMG_PATH.$smallpic;
 $imgurl_replace= str_replace($upload_url, '', $imgurl);
 if(!extension_loaded('gd') || strpos($imgurl_replace, '://')) return $imgurl;
 if(!file_exists($upload_path.$imgurl_replace)) return IMG_PATH.$smallpic;
 
 list($width_t, $height_t, $type, $attr) = getimagesize($upload_path.$imgurl_replace);
 if($width>=$width_t || $height>=$height_t) return $imgurl;
 www.111com.net
 $newimgurl = dirname($imgurl_replace).'/thumb_'.$width.'_'.$height.'_'.basename($imgurl_replace);
 
 if(file_exists($upload_path.$newimgurl)) return $upload_url.$newimgurl;
 
 if(!is_object($image)) {
  pc_base::load_sys_class('image','','0');
  $image = new image(1,0);
 }
 return $image->thumb($upload_path.$imgurl_replace, $upload_path.$newimgurl, $width, $height, '', $autocut) ? $upload_url.$newimgurl : $imgurl;
}

/*
 * 手机平台站点隐藏缩略图2和缩略图3
 */

$("#thumb2,#thumb3").parent().hide();
$("#thumb2,#thumb3").parent().prev().hide();