url下载文件到本地

$url = 'http://czd.111.net/extra/car2.jpg';
function download($url, $path = './huahua.jpg')
{
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, );
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, );
  $file = curl_exec($ch);
  curl_close($ch);
  $filename = pathinfo($url, PATHINFO_BASENAME);
  $resource = fopen($path, 'a');
  fwrite($resource, $file);
  fclose($resource);
}
download($url);die;

注意：图片地址不能为https