查找多维数组中的重复值

Given this array:

鉴于这个数组:

Array
(
    [0] => Array
        (
            [id] => 3
            [name] => aaa
        )

    [1] => Array
        (
            [id] => 2
            [name] => bbb
        )

    [2] => Array
        (
            [id] => 3
            [name] => aaa
        )

    [3] => Array
        (
            [id] => 1
            [name] => ccc
        )

    [4] => Array
        (
            [id] => 3
            [name] => aaa
        )        
)
Array
(
    [0] =