append data to json file php - php

Question

I am using this php library to communicate with the spotify api to get my user details. The spotify api returns user data which I then want to add to a json file. Basically, whatever is sent back from the api I want to append to the json file for each user.
The data returned from the api looks like the following when I do print_r($api->me()); This is basically coming from this api call.
stdClass Object ( [display_name] => Paul Flanagan
[email] => paulflanagan#gmail.com
[external_urls] => stdClass Object (
[spotify] => https://open.spotify.com/user/21aydctlhgjst3z7saj2rb4pq ) [followers] => stdClass Object (
[href] => [total] => 19 )
[href] => https://api.spotify.com/v1/users/2391231jasdasd1
[id] => 21aydctlhgjst3z7saj2rb4pq
[images] => Array ( [0] => stdClass Object (
[height] => [url] => https://scontent.xx.fbcdn.net/v/t1.0-1/p200x200/18301863_452622995075637_5517698155320169855_n.jpg?oh=9e949fafd3ee84705ea5c1fa1aa9c811&oe=59C9F63C
[width] => ) ) [type] => user [uri] => spotify:user:21aydctlhgjst3z7saj2rb4pq )
I want to write this code to a json file
I have attempted many approaches but as I am more javascript focused than php I am struggling to write the data correctly. My latest attempt at the code looks like this:
<?php
require 'vendor/autoload.php';
$session = new SpotifyWebAPI\Session(
'KEY1',
'KEY2',
'CALLBACK_URL'
);
$api = new SpotifyWebAPI\SpotifyWebAPI();
if (isset($_GET['code'])) {
$session->requestAccessToken($_GET['code']);
$api->setAccessToken($session->getAccessToken());
$file = "users.json";
$json = json_decode(file_get_contents($file), true);
$file = fopen($file,'w+');
fwrite($file, $api->me());
fclose($file);
print_r($api->me());
} else {
$options = [
'scope' => [
'user-read-email',
],
];
header('Location: ' . $session->getAuthorizeUrl($options)$
die();
}
?>

Answer 1

As $api->me() returns object - you cannot write it to a file directly. You should convert object to a string. Simple way is to json_encode it:
$file = "users.json";
$json = json_decode(file_get_contents($file), true);
$file = fopen($file,'w+');
fwrite($file, json_encode($api->me()));
fclose($file);
Next problem - is overwriting data. As you open file with w+ - you file gets truncated to 0 length.
Solution here depends on what you need with previous data. If you want to rewrite some data - I think current behaviour does it already.
If you want to append data to a file - you should use another mode when you open file, for example a+. But in this case, file contents won't be correct json, as you write to file not a single json string, but several strings, which is not correct json. So, it's up to you to find a proper solution.
Update:
According to file name, I suppose you store users in it. So, I think there's a list of users, encoded in json. So, a brief solution can be:
$file = "users.json";
$json = json_decode(file_get_contents($file), true);
// Now $json stores list of you current users. I suppose it's a simple array of arrays
// This is data for a new user
$new_user = $api->me();
// as data `$new_user` is object, I think you need to convert it to array
// this can be done as:
$new_user = json_decode(json_encode($new_user), true);
// now, add new user to existsing array
$json[] = $new_user;
$file = fopen($file,'w+');
// now we can encode `$json` back and write it to a file
fwrite($file, json_encode($json));
fclose($file);