Array
(
    [0] => Array
        (
            [nom_du_client] => SISSO
            [les_projets] => Array
                (
                    [0] => Array
                        (
                            [identifiant_du_projet] => matignon session 1
                            [date_de_debut] => 17/10/2021
                        )

                    [1] => Array
                        (
                            [identifiant_du_projet] => matignon session 2
                            [date_de_debut] => 28/11/2021
                        )

                )

        )

)