Avant 
Array
(
    [0] => Array
        (
            [champ1] => aa
            [champ2] => 1
        )

    [1] => Array
        (
            [champ1] => cc
            [champ2] => 1
        )

    [2] => Array
        (
            [champ1] => bb
            [champ2] => 1
        )

    [3] => Array
        (
            [champ1] => dd
            [champ2] => 1
        )

)
Après 
Array
(
    [0] => Array
        (
            [champ1] => aa
            [champ2] => 1
        )

    [1] => Array
        (
            [champ1] => bb
            [champ2] => 1
        )

    [2] => Array
        (
            [champ1] => cc
            [champ2] => 1
        )

    [3] => Array
        (
            [champ1] => dd
            [champ2] => 1
        )

)
$fruits[0]: citron
$fruits[1]: pommes
$fruits[2]: raisins