curl post 用json方式

if(!function_exists('tps_curl_post3')){
   function tps_curl_post3($url, $postData) {
      $postData = json_encode($postData);
      $curl = curl_init();  //初始化
      curl_setopt($curl,CURLOPT_URL,$url);  //设置url
      curl_setopt($curl,CURLOPT_HTTPAUTH,CURLAUTH_BASIC);  //设置http验证方法
      curl_setopt($curl, CURLOPT_TIMEOUT,30);
      curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);  //设置curl_exec获取的信息的返回方式
      curl_setopt($curl,CURLOPT_POST,1);  //设置发送方式为post请求
      curl_setopt($curl,CURLOPT_POSTFIELDS,$postData);  //设置post的数据

      curl_setopt($curl, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json',
            'Content-Length: ' . strlen($postData))
      );

      $result = curl_exec($curl);
      curl_close($curl);
      return json_decode($result,true);
   }
}