public static function getAll() { $sql = 'SELECT * FROM invoices'; $rows = DB::select($sql); $invoices = []; foreach ($rows as $row) { $invoice = Invoice::get($row->invoiceID); array_push($invoices, $invoice); } // foreach($invoices as $invoice){ // $invoice->totalPrice = Tool::getPriceByInvoiceID($invoice->id); // } return $invoices; }