PHP curl传输json数据及接收

……

//开启header
curl_setopt($curl, CURLOPT_HEADER, true);
//类型为json
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json; charset=utf-8'
)
);

//post传递
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, ($json));
……

……
//接收
$json = file_get_contents("php://input");
$json = json_decode($json, true);
print_r($json);
……