$params=[

    "a"=>"test",

    "b"=>"测试"

];

$header=[

"Content-Type: application/json; charset=utf-8",

"host: www.baidu.com"

];

$url="https://www.baidu.com/path";

$req = curl_init();

curl_setopt($req, CURLOPT_URL, $url);                //url设置

curl_setopt($req, CURLOPT_HTTPHEADER, $header);

curl_setopt($req, CURLOPT_HEADER, 0);

curl_setopt($req, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($req, CURLOPT_SSL_VERIFYPEER, false);

curl_setopt($req, CURLOPT_SSL_VERIFYHOST, false);

curl_setopt($req, CURLOPT_TIMEOUT, 10);   

if (strtolower($method) == "post") {

    curl_setopt($req, CURLOPT_POST, 1);                // post方法

    curl_setopt($req, CURLOPT_POSTFIELDS, json_encode($params,320));    // post的变量

}

$data = curl_exec($req);