无法访问php json解码的多维数组值curl

Question

当我执行下面的代码来访问koinex ticker api时，我得到一个数组，但是我怎么能只显示某些值：

echo $response[0][0][1];

echo $response['prices']['BTC'][0];

代码：

<?php

$getCurrency = "inr";
$displayArrayOutput = true;

// Get cURL resource
$curl = curl_init();
// Set some options - we are passing in a useragent too here
curl_setopt_array($curl, array(
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_URL => 'https://koinex.in/api/ticker',
    CURLOPT_USERAGENT => 'Something here'
));
// Send the request & save response to $resp
$response = curl_exec($curl);
// Close request to clear up some resources
$err = curl_error($curl);
curl_close($curl);

if ($err) {
} else {
    if($displayArrayOutput){
        $response = json_decode($response, true);
        print_r($response);

    }
    else{
        header("Content-type:application/json");
        echo 'touine';
    }
}


echo $response[0][0][1];
echo $response['prices']['BTC'][0];

?>

抱歉，对php有点新鲜，对任何其他解码json的方法开放