现在我有个二维数组array（
[aaa_0] => Array
(
[2] => 2
[4] => 4
[5] => 5
)
[aaa_1] => Array
(
[1] => 1
[2] => 2
[5] => 5
)
[aaa_2] => Array
(
[5] => 5
)
）我怎么样才能取出aaa_0和aaa_1和aaa_2中相同的键值？？即5
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