将数组转化为字符串,并加标志位p,使其不丢失信息,且可反转化 使用范围:数据库中存储一维数组,不用建表,只需保存为char(n)型即可-The array into a string, and add flags p, it does not lose information, and can be transformed into anti- Use: one-dimensional array stored in the database, do not build the tabl