Query in a while loop fetching stale data - php

Question

I am trying (and not succeeding) to run a while loop with a query that gets the last row in a table, uses that data then create a new row then selects the last row in the table again (which should be the row just created) then uses that data and creates a new row. This should repeat until the while loop is no longer true.
The problem I have is the while loop runs but always uses the row it selected the first time round. So the same row get inserted over and over until the while loop is false.
My question is how can I get the query to refresh when the while loop starts a new loop?
I have tried unset() but this did not work and am out of ideas. Here the while loop of my code (which is still in progress - still so much to add):-
while ($total_debt > 0) {
$get_dp_accounts_list_query = "SELECT account_id
FROM money_debt_planner
WHERE customer_id = '".$_SESSION['customer_id']."'
GROUP BY account_id";
$get_dp_accounts_list = $db->Execute($get_dp_accounts_list_query);
while (!$get_dp_accounts_list->EOF) {
$get_dp_accounts_listArray[] = array('account_id'=>$get_dp_accounts_list->fields['account_id']);
$get_dp_accounts_list->MoveNext();
}
foreach($get_dp_accounts_listArray as $acc_list) {
$get_last_dp_entry_query = "SELECT *
FROM money_debt_planner
WHERE customer_id = '".$_SESSION['customer_id']."'
AND account_id = '".$acc_list['account_id']."'
ORDER BY line_id DESC";
$get_last_dp_entry = $db->Execute($get_last_dp_entry_query);
if($get_last_dp_entry->fields['end_debt_balance'] <> 0) {
// calculate the interest this period
$accounts_balance = $get_last_dp_entry->fields['end_debt_balance'] + $get_last_dp_entry->fields['estimated_spending'];
$min_pay = $get_last_dp_entry->fields['min_pay_amount'];
$min_pay_rate = $get_last_dp_entry->fields['min_pay_rate'];
$interest_rate = $get_last_dp_entry->fields['interest_rate'];
$int_rate = $interest_rate /100;
$int_rate_a = $int_rate + 1;
$int_value_b = $accounts_balance ;
$int_value_c = ($int_rate_a * $int_value_b) - $int_value_b . ' ';
$int_value_d = $int_value_c / 12;
$statement_balance = $accounts_balance + $int_value_d;
$min_pay_rate = ($statement_balance) * $min_pay_rate / 100;
if($min_pay_rate < $min_pay) {
$new_bill_amount = $min_pay;
} else {
$new_bill_amount = $min_pay_rate;
}
if(($statement_balance) <= ($min_pay_rate) && ($statement_balance) <= $min_pay) {
$new_bill_amount = $statement_balance;
}
// next pay date
$next_due_day1 = date('d', strtotime ( $get_last_dp_entry->fields['date'] ));
$next_due_year_month1 = date('Y-m', strtotime ( $get_last_dp_entry->fields['date'] ));
$next_due_month_a_1 = strtotime ( "+ 1 month" , strtotime ( $next_due_year_month1 ) ) ;
$next_due_month_b_1 = date ( 'Y-m' , $next_due_month_a_1);
$total_days_in_this_month = date('t', strtotime($next_due_month_b_1) );
if($next_due_day1 >= $total_days_in_this_month) {
$next_due_date_a_1 = $total_days_in_this_month;
} else {
$next_due_date_a_1 = $next_due_day1;
}
$payment_date_from_account1 = $next_due_month_b_1 .'-' . $next_due_date_a_1;
$next_due1a = strtotime ( $payment_date_from_account1 ) ;
$next_due1 = date ( 'Y-m-d' , $next_due1a );
$dp_pay_date = $next_due1; // this will be 1 month from last entry
$interest_this_period = $int_value_d; // this will be interest on last end balance + est spending
$payment_this_period = $new_bill_amount; // this will be the min payment allowed including any over credit amount
$end_balance = ''; // this will be current open balance + spending + interest - payment
$sql = "INSERT INTO `money_debt_planner` (`customer_id`, `account_id`, `date`, `open_debt_balance`, `interest_rate`, `min_pay_rate`, `min_pay_amount`, `credit_limit`, `estimated_spending`, `interest_this_period`, `payment_this_period`, `end_debt_balance`)
VALUES ('".$_SESSION['customer_id']."', '".$acc_list['account_id']."', '".$dp_pay_date."', '".$get_last_dp_entry->fields['end_debt_balance']."', '".$get_last_dp_entry->fields['interest_rate']."', '".$get_last_dp_entry->fields['min_pay_rate']."', '".$get_last_dp_entry->fields['min_pay_amount']."', '".$get_last_dp_entry->fields['credit_limit']."', '".$get_last_dp_entry->fields['estimated_spending']."', '".$interest_this_period."', '".$payment_this_period."', '".$end_balance."')";
$db->Execute($sql);
} // end if balance zero
} // end account list
// to do this will be total debt balance utstanding
$total_debt = $total_debt - 1000;
}
Any help you can offer would be great :o)