将url文件链接保存到本地服务器

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public function saveUrlFile($name)
{
   $path = './Resource/temp_pdf/';
   if (!is_dir($path)) {
      mkdir($path);
      chmod($path, 0777);
   }

   $url = 'http://d.hiphotos.baidu.com/image/pic/item/50da81cb39dbb6fd493c67e70024ab18962b378f.jpg';

   $ext = '.jpg';
   $filename = $path . $name . $ext;
   ob_start();
   readfile($url);
   $img = ob_get_contents();
   ob_end_clean();
   $fp2 = fopen($filename, "a");
   fwrite($fp2, $img);
   fclose($fp2);
}