After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：PHP data type objects (learn later)
对象是复合类型，同时有字符串、浮点、整型等
2020-02-170个赞
Courses in the relevant section：PHP data type resource type
资源类型：图片，音乐，文件
2020-02-170个赞
常量很重要，通常大写，加引号
2020-02-170个赞
