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sort 将数组的元素由a-z排列 排序二维数组*会*将array转变为object
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asort 将数组排列且维持索引值的关系 排序二维数组*会*将array转变为object
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ksort 将数组的索引值排列 排序二维数组*不会*将array转变为object
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krsort 依照索引值的颠倒顺序将数组排列 排序二维数组*会*将array转变为object
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rsort 将数组的值由z-a重排 排序二维数组*不会*将array转变为object
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