84669 person learning
152542 person learning
20005 person learning
5487 person learning
7821 person learning
359900 person learning
3350 person learning
180660 person learning
48569 person learning
18603 person learning
40936 person learning
1549 person learning
1183 person learning
32909 person learning
类常量,对象初始化,属性重载
类的继承、多态与方法重写
类的声名与实例化
pdo查询记录值
pdo查询数据
pdo删除数据
pdo更新数据
pdo新增数据
pdo数据库连接
数据库的链接和数据的增删改查
类实例化,访问私有属性和公有属性
文件目录遍历
数组排序
获取子字符串
字符串替换函数