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如何组合这两个数组,如果有重复的数组只有一个使用PHP表示.

Array
(
    [0] => 18
    [1] => 20
    [2] => 28
    [3] => 29
)

Array
(
    [0] => 1
    [1] => 8
    [2] => 19
    [3] => 22
    [4] => 25
    [5] => 28
    [6] => 30
)