validate repeated in session

Best regards, I would like to please help me with the following:

I have the following values in session, what I want is to add the amount when the codes are equal

Array
(
    [0] => stdClass Object
        (
            [Insumo] => TAPA PS BANA-POL TRP MOT
            [Codigo] => 10041142
            [cantidad] => 10
        )

    [1] => stdClass Object
        (
            [Insumo] => DIVISION BCL PERFORADA-03
            [Codigo] => 10004797
            [cantidad] => 30
        )

    [2] => stdClass Object
        (
            [Insumo] => DIVISION BCL PERFORADA-03
            [Codigo] => 10004797
            [cantidad] => 30
        )

    [3] => stdClass Object
        (
            [Insumo] => TAPA PS BANA-POL TRP MOT
            [Codigo] => 10041142
            [cantidad] => 10
        )

    [4] => stdClass Object
        (
            [Insumo] => BASE GENERICA
            [Codigo] => 10004984
            [cantidad] => 10
        )

    [5] => stdClass Object
        (
            [Insumo] => DIVISION BCL PERFORADA-03
            [Codigo] => 10004797
            [cantidad] => 30
        )

)