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Array
(
    [0] => Array
        (
            [idnumber] => 1
            [firstname] => John
            [lastname] => Smith
            [age] => 23
        )

    [1] => Array
        (
            [idnumber] => 2
            [firstname] => Sue
            [lastname] => Davis
            [age] => 13
        )

    [2] => Array
        (
            [idnumber] => 3
            [firstname] => Peter
            [lastname] => Young
            [age] => 45
        )

    [3] => Array
        (
            [idnumber] => 4
            [firstname] => Alice
            [lastname] => Brown
            [age] => 56
        )

    [4] => Array
        (
            [idnumber] => 5
            [firstname] => Frank
            [lastname] => Gray
            [age] => 22
        )

    [5] => Array
        (
            [idnumber] => 6
            [firstname] => Betty
            [lastname] => Redwood
            [age] => 27
        )

    [6] => Array
        (
            [idnumber] => 7
            [firstname] => Jane
            [lastname] => Corner
            [age] => 29
        )

    [7] => Array
        (
            [idnumber] => 8
            [firstname] => Bob
            [lastname] => Church
            [age] => 19
        )

    [8] => Array
        (
            [idnumber] => 9
            [firstname] => Mary
            [lastname] => Collins
            [age] => 67
        )

    [9] => Array
        (
            [idnumber] => 10
            [firstname] => Herbert
            [lastname] => River
            [age] => 42
        )

    [10] => Array
        (
            [idnumber] => 11
            [firstname] => Lucy
            [lastname] => Hardy
            [age] => 13
        )

    [11] => Array
        (
            [idnumber] => 12
            [firstname] => Charles
            [lastname] => Winter
            [age] => 81
        )

    [12] => Array
        (
            [idnumber] => 13
            [firstname] => Samantha
            [lastname] => Weather
            [age] => 37
        )

    [13] => Array
        (
            [idnumber] => 14
            [firstname] => Karl
            [lastname] => Saunders
            [age] => 34
        )

    [14] => Array
        (
            [idnumber] => 15
            [firstname] => Angela
            [lastname] => Brown
            [age] => 35
        )

)

Result: