php 求二維數組的差集|比較二維數組的不一樣 array_diff

array_diff只針對一維數組有效，對二維數組無效（求出爲空或array(0)）。 手冊寫明是：Note: This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff($array1[0], $arr

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