Tableaux indicés <br>array_merge donne: Array
(
    [0] => Paris
    [1] => Lyon
    [2] => Marseille
    [3] => Nantes
    [4] => Orléans
    [5] => Tours
    [6] => Paris
)
<hr />Tableaux associatifs <br>array_merge donne: Array
(
    [Paris] => Capitale
    [Lyon] => 69
    [Marseille] => 13
    [Nantes] => 44
    [Orléans] => 45
    [Tours] => 37
)
<hr />array_merge_recursive donne : Array
(
    [Paris] => Array
        (
            [0] => 75
            [1] => Capitale
        )

    [Lyon] => 69
    [Marseille] => 13
    [Nantes] => 44
    [Orléans] => 45
    [Tours] => 37
)