addAdmin(添加管理员)
流程：
addAdmin.php(视图界面)[传递act的值] ---> doAdminAction.php(总处理) 通过include.php包含了所有函数--->根据传过来的act在admin.inc.php中找到合适的函数 ---> 调用mysql.func.php中的insert()插入数据库
一个表单，action=”doAdminAction.php?act=addAdmin”，传到addAdmin
act=addAdmin表示传过去一个act的参数，对应为addAdmin的操作
其中在doAdminAction.php中，act通过$_REQUEST[‘act’]传进来
设置一个include文件，里面require_once所有的php文件，这样就不用在每个文件中引入很多，只要包含一个include.php即可
在core文件夹内包含所有函数方法
上面的addAdmin函数就在core文件夹内的admin.inc.php中
首先用$_POST方法把这个表单所有数据都传过来保存在一个数组$arr中，其中表单input的name属性决定了传过来之后的标签。最后通过insert()函数进行插入数据库。
insert()函数在mysql.func.php中，是所有数据库功能的函数
注释：（1）join():把数组元素合并成一个字符串;array_keys() 函数返回包含数组中所有键名的一个新数组
（2）array_values() 函数返回一个包含给定数组中所有键值的数组，但不保留键名
（3）mysql_insert_id() 函数返回上一步 INSERT 操作产生的
拿上面那个为例介绍insert工作原理：
正常的sql语句插入数据库 insert (表名) (键名) values (键值)
array_keys()和array_values()返回包含数组所有键名、键值的新数组
最后要通过mysql_query($ssql)执行一下这个句柄
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