How to call the driver's license question bank in php

// +----------------------------------------------------------------------
//----------------------------------
// 驾照题库调用示例代码 － 聚合数据
// 在线接口文档：https://www.juhe.cn/docs/api/id/183?s=cpphpcn
//----------------------------------
header('Content-type:text/html;charset=utf-8');
//配置您申请的appkey
$appkey = "*********************";
//************1.题库接口************
$url = "http://api2.juheapi.com/jztk/query";
$params = array(
"key" => $appkey,//您申请的appKey
"subject" => "",//选择考试科目类型，1：科目1；4：科目4
"model" => "",//驾照类型，可选择参数为：c1,c2,a1,a2,b1,b2；当subject=4时可省略
"testType" => "",//测试类型，rand：随机测试(随机100个题目)，order：顺序测试(所选科目全部题目)
);
$paramstring = http_build_query($params);
$content = juhecurl($url,$paramstring);
$result = json_decode($content,true);
if($result){
if($result['error_code']=='0'){
print_r($result);
}else{
echo $result['error_code'].":".$result['reason'];
}
}else{
echo "请求失败";
}
//**************************************************
//************2.answer字段对应答案************
$url = "http://api2.juheapi.com/jztk/answers";
$params = array(
"key" => $appkey,//您申请的appk
);
$paramstring = http_build_query($params);
$content = juhecurl($url,$paramstring);
$result = json_decode($content,true);
if($result){
if($result['error_code']=='0'){
print_r($result);
}else{
echo $result['error_code'].":".$result['reason'];
}
}else{
echo "请求失败";
}
//**************************************************
/**
* 请求接口返回内容
* @param string $url [请求的URL地址]
* @param string $params [请求的参数]
* @param int $ipost [是否采用POST形式]
* @return string
*/
function juhecurl($url,$params=false,$ispost=0){
$httpInfo = array();
$ch = curl_init();
curl_setopt( $ch, CURLOPT_HTTP_VERSION , CURL_HTTP_VERSION_1_1 );
curl_setopt( $ch, CURLOPT_USERAGENT , 'JuheData' );
curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT , 60 );
curl_setopt( $ch, CURLOPT_TIMEOUT , 60);
curl_setopt( $ch, CURLOPT_RETURNTRANSFER , true );
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
if( $ispost )
{
curl_setopt( $ch , CURLOPT_POST , true );
curl_setopt( $ch , CURLOPT_POSTFIELDS , $params );
curl_setopt( $ch , CURLOPT_URL , $url );
}
else
{
if($params){
curl_setopt( $ch , CURLOPT_URL , $url.'?'.$params );
}else{
curl_setopt( $ch , CURLOPT_URL , $url);
}
}
$response = curl_exec( $ch );
if ($response === FALSE) {
//echo "cURL Error: " . curl_error($ch);
return false;
}
$httpCode = curl_getinfo( $ch , CURLINFO_HTTP_CODE );
$httpInfo = array_merge( $httpInfo , curl_getinfo( $ch ) );
curl_close( $ch );
return $response;
}