php curl保存远程服务器图片
function loadimagecurl($save_to){
        $ch = curl_init($this->source);
        $fp = fopen($save_to, wb);
// set url and other appropriate options
        $options = array(curlopt_file => $fp,
                         curlopt_header => 0,
                         curlopt_followlocation => 1,
                         curlopt_timeout => 60); // 1 minute timeout (should be enough)
curl_setopt_array($ch, $options);
curl_exec($ch);
        curl_close($ch);
        fclose($fp);
    }
$info = @getimagesize($this->source);
    $mime = $info['mime'];
// what sort of image?
    $type = substr(strrchr($mime, '/'), 1);
    switch ($type){
        case 'jpeg':
            $image_create_func = 'imagecreatefromjpeg';
            $image_save_func = 'imagejpeg';
            $new_image_ext = 'jpg';
// best quality: 100
            $quality = isset($this->quality) ? $this->quality : 100;
            break;
case 'png':
            $image_create_func = 'imagecreatefrompng';
            $image_save_func = 'imagepng';
            $new_image_ext = 'png';
// compression level: from 0  (no compression) to 9
            $quality = isset($this->quality) ? $this->quality : 0;
            break;
case 'bmp':
            $image_create_func = 'imagecreatefrombmp';
            $image_save_func = 'imagebmp';
            $new_image_ext = 'bmp';
            break;
case 'gif':
            $image_create_func = 'imagecreatefromgif';
            $image_save_func = 'imagegif';
            $new_image_ext = 'gif';
            break;
case 'vnd.wap.wbmp':
            $image_create_func = 'imagecreatefromwbmp';
            $image_save_func = 'imagewbmp';
            $new_image_ext = 'bmp';
            break;
case 'xbm':
            $image_create_func = 'imagecreatefromxbm';
            $image_save_func = 'imagexbm';
            $new_image_ext = 'xbm';
            break;
default:
            $image_create_func = 'imagecreatefromjpeg';
            $image_save_func = 'imagejpeg';
            $new_image_ext = 'jpg';
    }
if(isset($this->set_extension)){
        $ext = strrchr($this->source, .);
        $strlen = strlen($ext);
        $new_name = basename(substr($this->source, 0, -$strlen)).'.'.$new_image_ext;
    }else{
        $new_name = basename($this->source);
    }
$save_to = $this->save_to./blog_insert_temp_.time().mt_rand(1,99)...$new_image_ext;
    //输出对象 组成跟$_file变量一样 得到后自己和平常图片上传处理一样了
    $img_info['name'] = basename($this->source);
    $img_info['type'] = $mime;
    $img_info['size'] = 1000;
    $img_info['tmp_name'] = $save_to;
    $img_info['error'] = 0;
if($method == 'curl'){
        $save_image = $this->loadimagecurl($save_to);
    }elseif($method == 'gd'){
        $img = $image_create_func($this->source);
if(isset($quality)){
               $save_image = $image_save_func($img, $save_to, $quality);
            }else{
               $save_image = $image_save_func($img, $save_to);
            }
}
         return $img_info;
    }