main()
[0] (95) var_2 = NEW("TestClass",)
[1] (95) = DO_FCALL(,)
[2] (95) = ASSIGN($tc,var_2)
[3] (96) = INIT_METHOD_CALL($tc,"func_0")
[4] (96) = SEND_VAR_EX($argv,)
[5] (96) = DO_FCALL(,)
[6] (98) = RETURN(0x1,)
...

func_default($m,$hint)
[0] (86) $m = RECV(,)
[1] (86) $hint = RECV(,)
[2] (88) tmp_3 = CONCAT("\$mode=",$m)
[3] (88) tmp_2 = CONCAT(tmp_3,$hint)
[4] (88) = ECHO(tmp_2,)
[5] (89) var_2 = NEW("Exception",)
[6] (89) = SEND_VAL_EX("\$mode is invalid",)
[7] (89) = DO_FCALL(,)
[8] (89) = THROW(var_2,)