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ThinkPHP中Session用法详解_php实例

May 16, 2016 pm 08:29 PM
session thinkphp usage

本文实例讲述了ThinkPHP中Session用法。分享给大家供大家参考。具体如下:

在ThinkPHP封装了Session类,用户可以直接使用,常用的方法有:

Session::set(name, value):注册 session 。

Session::is_set(name):检查Session的值是否设置。

Session::get(name):读取 session 。

Session::clear():清空Session。

Session::destroy():销毁 session 。

ThinkPHP 默认开启了 session 会话,因此在使用 Session 类之前不需要使用 session_start() 函数来开启会话.

使用 session 实例

下面以表单提交的方式注册 session,并在其他两个页面分别以模板方式和操作中以 Session::get 方式读出 session 值.

注册 session

User 模块 sessionTest 操作注册 session 例子:

复制代码 代码如下:
class UserAction extends Action{ 
public function session(){ 
if(!emptyempty($_POST['username'])){ 
Session::set('username',$_POST['username']); 

$this->display(); 

}

sessionTest.html 模板(片段):
复制代码 代码如下:

 
{$_SESSION['username']} 你好! 
首页 
本模块其他页面 
注销请输入您的用户名: 

 
 

 

 
 

当填入用户名(如 testuser),点击 提交 按钮后,提交至 sessionTest 方法(即当前页面)处理并注册 session 值,以模板标签 present 来控制输出逻辑,检测到已经注册 $_SESSION['username'] 变量即输出:

testuser 你好! 首页 注销

否则会输出表单。

检测 session 是否注册

模板里检测

在模板里面,可以直接使用 present 或 notempty 甚至 switch 等标签判断 session 变量是否注册,以决定输出对应的 session 值(直接以输出数组单元的方式输出 session 变量值)或显示其他页面元素,具体可参见本教程模板标签部分内容以及上面的例子.

操作里检测

在操作里,可以使用 Session::is_set 方法检查 Session 的值是否设置,例如 User 模块 user 操作如下:

复制代码 代码如下:
public function user(){ 
// 由于直接在操作里输出,为避免乱码 
header("Content-Type:text/html; charset=utf-8"); 
if(Session::is_set('username')){ 
echo Session::get('username').' 你好'; 
}else{ 
echo 'session 未注册'; 


其他模块页面

在其他页面(如 Index/index)里,判断并读取 session 的代码片段:

复制代码 代码如下:
{$_SESSION['username']} 你好!未登录

session 无效(无法传递)

ThinkPHP 中可能出现 session 无效(无法传递至其他页面)的情况,可能的原因如下:

使用 Session 类头字母未大写,如:session::set.

页面有信息输出,如入口文件有空行等.

服务器上(Linux/Unix)的 session 存储路径(session.save_path)权限不正确导致无法将 session 信息正确存储.

作用域问题建议:

ThinkPHP 的 Session 类只是对 session 做了简单的包装,实际可以在操作中直接使用 PHP 原生的 session 函数,官方亦是如此建议.

希望本文所述对大家的ThinkPHP框架程序设计有所帮助。

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