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Jun 23, 2016 pm 02:31 PM

1. session_start() : 在PHP中开始一个会话（注意，所有的PHP会话信息都在页面的最顶部，在任何HTML代码之前，否则会出错！）

$_SESSION['...'] : 会话数组（单引号里面填写要引用或赋值的对象的变量名或常量名）

2. setcookie() : 用于储存会话信息，会话ID

$_COOKIE['...'] : COOKIE数组

3. session_unset() : 可以从会话中提取变量

4. 使用包含文件提高代码效率（注意，包含文件可以使用任意扩展名，但其实仍应使用.php作为扩展名，使用其他扩展名是为了保护机密信息或作为提醒等）

5. isset函数检查是否设置了变量（它不检查变量值，只检查是否使用了变量）

6. print_r() : 这个函数可以输出变量的信息

7. 变量名1as变量名2 : 其中as的作用是变量名2当作变量名1

8. 引用文件：正因为在文件不存在或被重命名后脚本不会继续执行，因此我们推荐使用 require() 而不是 include()

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