/*返回一个302地址*/
     function  curl_post_302($url, $vars) {

          $ch = curl_init();
          curl_setopt($ch,  CURLOPT_RETURNTRANSFER, 1);
          curl_setopt($ch, CURLOPT_URL,  $url);
          curl_setopt($ch, CURLOPT_POST, 1);
          curl_setopt($ch,  CURLOPT_FOLLOWLOCATION, 1); // 302 redirect
          curl_setopt($ch,  CURLOPT_POSTFIELDS, $vars);
          $data = curl_exec($ch);
          $Headers =  curl_getinfo($ch);
          curl_close($ch);
          if ($data != $Headers)
          return  $Headers["url"];
          else
          return false;

     }