Error Using $this when not in object context - php

Question

First post here so apologies in advance if this is an incorrect format. I am working with the Instagram API to pull images. The Instagram API only returns 1 page of images at a time, but offers pagination and next_url to grab the next page of images. When I use the function fetchInstagramAPI below, to grab only the first page, the php code works fine.
When I attempt to use the loopPages function together with the fetchInstagramAPI function, to try and grab all pages at once, I receive the error "Using $this when not in object context". Any idea? Thank you for the help in advance.
Function fetchInstagramAPI gets our data
<?php
function fetchInstagramAPI($url){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 20);
$contents = curl_exec($ch);
curl_close($ch);
return json_decode($contents);
}
Function loopPages uses pagination and next_url to grab all pages of images
function loopPages($url){
$gotAllResults = false;
$results = array();
while(!$gotAllResults) {
$result = $this->fetchInstagramAPI($url);
$results[] = $result;
if (!property_exists($result->pagination, 'next_url')) {
$gotAllResults = true;
} else {
$url = $result->pagination->next_url;
}
}
return $results;
}
This pulls, parses, then displays the images in a browser
$all_url = 'https://api.instagram.com/v1/users/{$userid}/media/recent/?client_id={$clientid}';
$media = loopPages($all_url);
foreach ($media->data as $post): ?>
<!-- Renders images. #Options (thumbnail, low_resoulution, standard_resolution) -->
<a class="group" rel="group1" href="<?= $post->images->standard_resolution->url ?>"><img src="<?= $post->images->thumbnail->url ?>"></a>
<?php endforeach ?>

Answer 1

In PHP and many object oriented languages $this is a reference to the current object (or the calling object). Because your code don't seem to be in any class $this doesn't exists. Check this link for PHP classes and objects.
Since you have just defined your functions in the file you can try calling the function with $result = fetchInstagramAPI($url); (without $this).
edit:
For foreach check if $media->data is in fact an array and try another syntax which i think is easier to read.
edit2:
Since you now know how your $media looks like you can wrap around another foreach loop that will iterate through the pages:
foreach ($media as $page){
foreach ($page->data as $post) {
echo '<!-- Renders images. #Options (thumbnail, low_resoulution, standard_resolution) -->';
echo '<a class="group" rel="group1" href="' . $post->images->standard_resolution->url . '"><img src="' . $post->images->thumbnail->url . '"></a>';
}
}