How to mount the Json return

I do not know how to do it or who to turn to. I need to do this json return with Jquery.Ajax

I would like to pass parameters more or less like this

In JAVASCRIPT I have this

        $.ajax({
            type: "POST",
            url: "../execs/proc_fluxocaixa.php",
            data: {d_acao: "grafico", c_tipo: tipo, c_dia: dia},
            dataType: "json",
            success: function(ret_dados){
               var pageviews ret_dados["r_dados"];
            }
        });

My PHP looks like this:

if($acao == "grafico"){
    $tipo = $_POST["tipo"];
    $dias = 30;
    $mes  = 3;

    if ($tipo == 0){
        ///Debito

        $Saida[] = array();
        for($i=1; $i <= $dias; $i++) {
            $dataC = date("Y-$mes-$i");

            $diaSQL = $Sv->selectDB("SELECT SUM(valor) TotalDia FROM mov_contas WHERE tipo = 'D' AND apagado = 0 AND banco = 0 AND data >= '$dataC 00:00:00' AND data <= '$dataC 23:59:59' GROUP BY data");

            if (count($diaSQL) == 0){
                $TotalValDia = 0;
            } else {
                $TotalValDia = $diaSQL[0]["TotalDia"];
            }

            $Saida[] = $i . "," . $TotalValDia;
        }
    }

    $retorno["r_dados"] = $Saida;
}

How do I in PHP and return to look like this:

            var pageviews = [
                [1, randValue()],
                [2, randValue()],
                [3, 2 + randValue()],
                [4, 3 + randValue()],
                [5, 5 + randValue()],
                [6, 10 + randValue()],
                [7, 15 + randValue()],
                [8, 20 + randValue()],
                [9, 25 + randValue()],
                [10, 30 + randValue()],
                [11, 35 + randValue()],
                [12, 25 + randValue()],
                [13, 15 + randValue()],
                [14, 20 + randValue()],
                [15, 45 + randValue()],
                [16, 50 + randValue()],
                [17, 65 + randValue()],
                [18, 70 + randValue()],
                [19, 85 + randValue()],
                [20, 80 + randValue()],
                [21, 75 + randValue()],
                [22, 80 + randValue()],
                [23, 75 + randValue()],
                [24, 70 + randValue()],
                [25, 65 + randValue()],
                [26, 75 + randValue()],
                [27, 80 + randValue()],
                [28, 85 + randValue()],
                [29, 90 + randValue()],
                [30, 95 + randValue()]
            ];