Тогда так:
foreach ($results as $result) {
$admin_comments_info = $this->model_sale_order->getOrderHistories($result['order_id']);
$admin_comments = '';
foreach ($admin_comments_info as $admin_comment_info) {
if (!empty($admin_comment_info['comment'])) {
$admin_comments .= $admin_comment_info['comment'] . PHP_EOL;
}
}
$data['orders'][] = array(
'order_id' => $result['order_id'],
'customer' => $result['customer'],
'telephone' => $result['telephone'],
'shipping_address_1' => $result['shipping_address_1'],
'comment' => $result['comment'],
'admin_comments' => $admin_comments,
'order_status' => $result['order_status'] ? $result['order_status'] : $this->language->get('text_missing'),
'total' => $this->currency->format($result['total'], $result['currency_code'], $result['currency_value']),
'date_added' => date($this->language->get('date_format_short'), strtotime($result['date_added'])),
'date_modified' => date($this->language->get('date_format_short'), strtotime($result['date_modified'])),
'shipping_code' => $result['shipping_code'],
'view' => $this->url->link('sale/order/info', 'token=' . $this->session->data['token'] . '&order_id=' . $result['order_id'] . $url, true),
'edit' => $this->url->link('sale/order/edit', 'token=' . $this->session->data['token'] . '&order_id=' . $result['order_id'] . $url, true)
);
}