1. $ch = curl_init();
   
2. curl_setopt($ch, CURLOPT_URL, $url);
   
3. curl_setopt($ch, CURLOPT_POST, 1);
   
4. curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
   
5. curl_exec($ch);
   
6. curl_close($ch);

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如果$data是字符串，则Content-Type是application/x-www-form-urlencoded。

如果$data是k=>v的数组，则Content-Type是multipart/form-data