Saving objects in array back to JSON - php

Question

I'm trying to filter out some unwanted Instagram images based on a review score that is a part of the photo caption.
I'm using the Instagram PHP API by cosenary for it and I have the data, and I have been able to filter out the entries with the correct syntax for a review score (*/10).
The problem is trying to get the objects back into json form so I can cache it so I dont have to keep making a million requests to Instagram.
I am trying to store the objects in an array and then encode the array back to json, but I keep getting the error in
Trying to get property of non-object in /Users/***/Sites/instagram/index.php on line 16
Here is what I have so far.
<?php
require_once('instagram.class.php');
$app_key = '<removed>';
$instagram = new Instagram($app_key);
$media = $instagram->getTagMedia('kittens');
$pattern = '/\d+\/+10/';
$fulldata = array();
if($media) {
do {
foreach ($media->data as $entry) {
if(is_object($entry) && preg_match($pattern, $entry->caption->text)) {
$fulldata[] = $entry;
}
}
} while ($media = $instagram->pagination($media));
}
?>
<pre>
<? echo json_encode($fulldata); ?>
</pre>
I'm not sure if that is_object($entry) does much.

Answer 1

This should work
<?php
require_once('instagram.php');
$app_key = '';
$instagram = new Instagram($app_key);
$media = $instagram->getTagMedia('cats');
$pattern = '/\d+\/+10/';
$fulldata = array();
if($media) {
do {
foreach ($media->data as $entry) {
$text = $entry->caption->text;
if(preg_match($pattern, $text)) {
$fulldata[] = $entry;
}
}
} while ($media = $instagram->pagination($media));
}
?>
<pre>
<? echo json_encode($fulldata); ?>
</pre>