PHP BD error line 72 - php

Question

The error is Fatal error: Call to undefined method stdClass::retrieve_all_accounts() in /home/mjcrawle/public_html/cit0215/assignment5/onlinebanking/viewaccounts.php on line 72
I am not getting any html errors so I will leave that out.
My php code up to the error is:
<?php
require_once('footer_nav/navigation.inc.php');
require_once('../websiteconfig.inc.php');
require_once('../class/person_class.php');
require_once('../class/database.class.php');
/*Start Session*/
session_start();
$currentMember =unserialize($_session['currentMember']);
/*DataBase*/
$db = new Database;
$conn = $db->connection;
?>
<td width="16"> </td>
<td width="595">
</td>
</tr>
</div>
<h2>Accounts</h2>
</td>
<table id="accounts" summary="Bank Account Balance Information">
<thread>
<tr>
<th>Account Number</th>
<th>Account Balance</th>
</tr>
</thead>
<tbody>
<php?
/*Accounts*/
$currentMember->connection = $conn;
this is where I get the error line 72:
$accounts = $currentMember->retrieve_all_accounts();
/* Loop Though Accounts*/
while($account = mysqli_fetch_assoc($account)) {
/* Retrieve Account Balance*/
$bankaccount = new Bankaccount ($account['BankAccountID']);
$bankaccount->connection = $conn;
$balance = mysqli_fetch_assoc($bankaccount->retrieve_current_balance());
echo '<tr>' . "\n";
echo "\t" . '<td class="account_number">' . $account['BankAccountID'] . '</td>' . "\n";
echo "\t" . '<td class="account_balance">$' . number_format($balance['CurrentBalance'], 2) . '</td>' . "\n";
echo '</tr>' . "\n";
}
/*Closed DataBase*/
mysqli_close($db->connection);
?>

Answer 1

First, you are using this, in your first portion of code :
<php?
/*Accounts*/
$currentMember->connection = $conn;
If you really copy-pasted this, you have a problem here : this is not PHP code.
Instead, you should have :
<?php
/*Accounts*/
$currentMember->connection = $conn;
Note that a PHP opening tag is <?php and not <php?
Then, your $currentMember variable is set this way :
$currentMember =unserialize($_session['currentMember']);
It seems this makes $currentMember just on container, and not an instance of a class that would have a retrieve_all_accounts() method.
So, when trying to call that method :
$accounts = $currentMember->retrieve_all_accounts();
You get a Fatal error, because there is no such method in your $currentMember object.