JSON decode shows "Array" - php

Question

This part:
$response_2 = json_decode($response_2, true);
...of the code below is echoed literally as "Array" in the browser. If I remove the part, the full $response_2 is echoed in browser in JSON-format just like in this example: https://developer.spotify.com/web-api/get-list-users-playlists/
How come?
<?php
$url = 'https://accounts.spotify.com/api/token';
$method = 'POST';
$credentials = "hidden:hidden";
$headers = array(
"Accept: */*",
"Content-Type: application/x-www-form-urlencoded",
"Authorization: Basic " . base64_encode($credentials));
$data = 'grant_type=client_credentials';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);
$response = json_decode($response, true);
$token = $response['access_token'];
echo "My token is: " . $token;
$headers_2 = array(
"Accept: */*",
"Content-Type: application/x-www-form-urlencoded",
('Authorization: Bearer ' . $token));
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,'https://api.spotify.com/v1/users/wizzler/playlists');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers_2);
curl_setopt($ch, CURLOPT_POST, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response_2 = curl_exec($ch);
curl_close($ch);
$response_2 = json_decode($response_2, true);
echo $response_2;
?>

Answer 1

When you use echo on an array, it just prints out the literal string Array. This is just a quirk of PHP.
If you want to print out the contents of the array, you can use print_r() or var_dump().
However it seems like what you actually want to do is print the JSON, which is the string. $response_2 is already a string, so print it out.