php variable using mongodb not showing on website server - php

Question

i am making a twitter clone website using php, and this is the script for creating a tweet:
<?php
session_start();
require_once('twitterdbconnect.php');
if(!isset($_POST['body'])) { //see if the post variable has the body of our tweet
exit;
}
$user_id = $_SESSION['user']; //if there is a tweet get the users id from session
$userData = $db->users->findOne( array('_id'=>$user_id)); //get the users data by asking the database for this user
$body = substr($_POST['body'], 140); //body is the first 140 characters of the post
$date = date('Y-m-d H:i:s');
$db->tweets->insertOne( array( //create a tweets collection and send the tweet there
'authorId' => $user_id,
'authorName' => $userData['username'],
'body' => $body,
'created' => $date
));
header('Location: home.php');
?>
this is the script of printing it on the home page:
<div>
<?php
$recent_tweets = get_recent_tweets($db);
foreach($recent_tweets as $tweet) {
echo '<p>' . $tweet['authorName'] .'</p>';
echo '<p>' . $tweet['body'] . '</p>';
echo '<p>' . $tweet['created'] . '</p>';
echo '<hr>';
}
?>
</div>
the other variables seem to work, but the body variable does not show up and the end result is so:
How can I make it appear as so:
?