php图片上传并生成缩略图效果

    if (!is_uploaded_file($_files[$filename][tmp_name])) {
        dsetcookie('setok','upload1');
        header("location:111cn.net/profile");
        exit;
    }
    $file = $_files[$filename];
    $pinfo = pathinfo($file["name"]);
    if ($filetype=="null") {
        $filetype = $pinfo['extension'];
    }
    if (!in_array(strtolower($pinfo['extension']),array("jpg","jpeg","png","gif"))) {
        dsetcookie('setok','upload3');
        header("location:111cn.net/profile");
        exit;
    }

    if($max_file_size < $file["size"]) {//检查文件大小
        dsetcookie('setok','upload2');
        header("location:111cn.net/profile");
        exit;
    }
    if(!in_array($file["type"],$uptypes)) { //检查文件类型
        dsetcookie('setok','upload3');
        header("location:111cn.net/profile");
        exit;
    }
    if(!file_exists($path_im)) {
        mkdir($path_im);
    }

    $filename = $file["tmp_name"];
    $im_size = getimagesize($filename);

    $src_w = $im_size[0];
    $src_h = $im_size[1];
    $src_type = $im_size[2];

    $all_path = $path_im.$newname.".".$filetype;//路径+文件名,目前以上传时间命名
    if (file_exists($all_path)) {
        @unlink($all_path);
    }
    if(!move_uploaded_file ($filename,$all_path)) {
        dsetcookie('setok','upload4');
        header("location:111cn.net/profile");
        exit;
    }
    $pinfo = pathinfo($all_path);
    $fname = $pinfo[basename];

    switch($src_type) {//判断源图片文件类型
         case 1://gif
         $src_im = @imagecreatefromgif($all_path);//从源图片文件取得图像
         break;
         case 2://jpg
         $src_im = @imagecreatefromjpeg($all_path);
         break;
         case 3://png
         $src_im = @imagecreatefrompng($all_path);
         break;
         //case 6:
         //$src_im=imagecreatefromwbmp($all_path);
         //break;
         default:
         dsetcookie('setok','upload3');
         header("location:111cn.net/profile");
         exit;
    }

   if($smallmark == 1) {
       if(!file_exists($path_sim)) {//检查缩略图目录是否存在，不存在创建
           mkdir($path_sim);
       }
       if ($smallname) $newname=$smallname;
       $sall_path = $path_sim.$newname.".".$filetype;
       if (file_exists($sall_path)) {
           @unlink($sall_path);
       }
       if($src_w <= $dst_sw) { // 原图尺寸 <= 缩略图尺寸
           if ($dstsh==0)  {
                $dst_sim = @imagecreatetruecolor($src_w,$src_h); //新建缩略图真彩位图
                $sx=$sy=0;
           } else {
                $dst_sim = @imagecreatetruecolor($dstsw,$dstsh); //新建缩略图真彩位图
                $sx=($dstsw-$src_w)/2;
                $sy=($dstsh-$src_h)/2;
           }
           $img = @imagecreatefrompng("images/phbg.png");
           @imagecopymerge($dst_sim,$img,0,0,0,0,$dstsw,$dstsh,100); //原图图像写入新建真彩位图中
           @imagecopymerge($dst_sim,$src_im,$sx,$sy,0,0,$src_w,$src_h,100); //原图图像写入新建真彩位图中
       }

       if($src_w > $dst_sw) { // 原图尺寸 > 缩略图尺寸
           $dst_sh = $dst_sw/$src_w*$src_h;
           if ($dst_sh<$dstsh) {
               $dst_sh=$dstsh;
               $dst_sw=$dst_sh/$src_h*$src_w;
           }
           if ($dstsh==0) {
                $dst_sim = @imagecreatetruecolor($dst_sw,$dst_sh); //新建缩略图真彩位图（等比例缩小原图尺寸）
           } else {
                $dst_sim = @imagecreatetruecolor($dstsw,$dstsh); //新建缩略图真彩位图（等比例缩小原图尺寸）
           }
           @imagecopyresampled($dst_sim,$src_im,0,0,0,0,$dst_sw,$dst_sh,$src_w,$src_h); //原图图像写入新建真彩位图中
       }

       switch($src_type) {
            case 1:@imagegif($dst_sim,$sall_path,$simclearly);//生成gif文件，图片清晰度0-100
            break;
            case 2:@imagejpeg($dst_sim,$sall_path,$simclearly);//生成jpg文件，图片清晰度0-100
            break;
            case 3:@imagepng($dst_sim,$sall_path,$simclearlypng);//生成png文件，图片清晰度0-100
            break;
            //case 6:
            //imagewbmp($dst_sim,$sall_path);
            break;
       }
       //释放缓存
       @imagedestroy($dst_sim);
    }
    @imagedestroy($src_im);
    return $newname.".".$filetype;
}
?>