①array()创建数组;
②count()返回数组中元素的数目;
③array_push()将一个或多个元素插入数组的末尾(入栈);
④array_column()返回输入数组中某个单一列的值;
⑤array_combine()通过合并两个数组来创建一个新数组;
⑥array_reverse()以相反的顺序返回数组;
⑦array_unique()删除数组中的重复值;
⑧in_array()检查数组中是否存在指定的值;
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