PHP CURLリクエストのヘッダパラメータを設定する方法

function http_post($sUrl, $aHeader, $aData){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_URL, $sUrl);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($aData));
    $sResult = curl_exec($ch);
    if($sError=curl_error($ch)){
        die($sError);
    }
    curl_close($ch);
    return $sResult;
}
 
$url = 'https://www.example.com;
$header = array('User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36');
$data = array();
$data = http_post($url,$header,$data);

/**
 * 余票查询
 * leftTicketDTO.train_date: 时间
 * leftTicketDTO.from_station: 出发车站电码
 * leftTicketDTO.to_station: 目的车站电码
 * purpose_codes: 乘客类型（成人:ADULT，学生:0X00）
 * author 洋葱
 * @return bool|mixed
 */
function get_left_tickets(){
    $url = 'https://kyfw.12306.cn/otn/leftTicket/queryZ?';
//    $url = 'https://kyfw.12306.cn/otn/leftTicketPrice/query?';
    $param = [
        'leftTicketDTO.train_date' => '2019-02-13',
        'leftTicketDTO.from_station' => 'BJP',
        'leftTicketDTO.to_station' => 'SHH',
        'purpose_codes' => 'ADULT'
    ];
    $http_param = http_build_query($param);
    $url = $url.$http_param;
    //重写"User-Agent"字符串来假冒特定浏览器以解决访问限制的问题
    $header = array('User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36');
    $data = curl_request($url,true,'GET',null,$header);
    if($data){
        $data = json_decode($data,true);
    }
    return $data;
}