Array
(
    [0] => Array
    (
        [name] => "Size"
        [value] => "Large"
        [id] => "1201"
    )

    [1] => Array
    (
        [name] => "Size"
        [value] => "Small"
        [id] => "1203"
    )

    [2] => Array
    (
        [name] => "Size"
        [value] => "Medium"
        [id] => "1204"
    )

    [3] => Array
    (
        [name] => "Size"
        [value] => "Large"
        [id] => "1205"
    )

    [4] => Array
    (
        [name] => "Size"
        [value] => "Large"
        [id] => "1206"
    )

    [5] => Array
    (
        [name] => "Size"
        [value] => "Large"
        [id] => "1207"
    )

)

array_map("unserialize", array_unique(array_map("serialize", $input)));