php中 curl模拟post发送json并接收json（转）

https://blog.csdn.net/wuzuyu365/article/details/90290556
function http($url, $data = NULL, $json = false)
{
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    if (!empty($data)) {
        if($json && is_array($data)){
            $data = json_encode( $data );
        }
        curl_setopt($curl, CURLOPT_POST, 1);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        if($json){ //发送JSON数据
            curl_setopt($curl, CURLOPT_HEADER, 0);
            curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type: application/json; charset=utf-8', 'Content-Length:' . strlen($data))
            );
        }
    }
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $res = curl_exec($curl);
    curl_close($curl);
    return $res;
}