如果使用CURL下载从微信手机端上传的图片？参考下面代码

/**
 * CURL下载文件 成功返回文件名，失败返回false
 * @param $url
 * @param string $savePath
 * @return bool|string
 * @author Zou Yiliang
 */
public function downFile($url, $savePath = './uploads')
{
    //$url = 'http://www.baidu.com/img/bdlogo.png';
    /*
    HTTP/1.1 200 OK
    Connection: close
    Content-Type: image/jpeg
    Content-disposition: attachment; filename="cK4q4fLsp7YOlaqxluDOafB.jpg"
    Date: Sun, 18 Jan 2015 16:56:32 GMT
    Cache-Control: no-cache, must-revalidate
    Content-Length: 963704
    */

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    curl_setopt($ch, CURLOPT_HEADER, TRUE);    //需要response header
    curl_setopt($ch, CURLOPT_NOBODY, FALSE);    //需要response body

    $response = curl_exec($ch);

    //分离header与body
    $header = '';
    $body = '';
    if (curl_getinfo($ch, CURLINFO_HTTP_CODE) == '200') {
        $headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE); //头信息size
        $header = substr($response, 0, $headerSize);
        $body = substr($response, $headerSize);
    }

    curl_close($ch);

    //文件名
    $arr = array();
    if (preg_match('/filename="(.*?)"/', $header, $arr)) {

        $file = date('Ym') . '/' . $arr[1];
        $fullName = rtrim($savePath, '/') . '/' . $file;

        //创建目录并设置权限
        $basePath = dirname($fullName);
        if (!file_exists($basePath)) {
            @mkdir($basePath, 0777, true);
            @chmod($basePath, 0777);
        }

        if (file_put_contents($fullName, $body)) {
            return $file;
        }
    }

    return false;
}