curl curl请求

$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);