我有如下数组Array([0]=>Array([catid]=>3[parent_id]=>1[catname]=>Uncategorized[catdesc]=>[nleft]=>20[nright]=>21[nlevel]=>1)[1]=>Array([catid]=>5[parent_id]=>2[catname]=>Category2[catdesc]=>[nleft]=>7[nright]=>8[nlevel]=>2)[2]=>Array([catid]=>3[parent_id]=>1[catname]=>Uncategorized[catdesc]=>[nleft]=>2