trade_list = array(); $std->error = true; if (isset($OrderClass, $UserClass)) { $is_sel1_valid= $OrderClass->is_bc_valid($bc1, 1, null); $is_sel2_valid= $OrderClass->is_bc_valid($bc2, null, 1); if (!$is_sel1_valid || !$is_sel2_valid) { return; } $tradeList = $OrderClass->last_transaction_list(0,10,$bc1,$bc2); $std->trade_list = $tradeList; $std->error = false; } echo json_encode($std); } else { return false; }