PHP创建和使用session cookie变量
// session start
session_start(); // 开始一个会话,如果要使用session程序最前面一定要加上这句
$_SESSION['user_id'] = ‘123′;//给一个session 变量赋值,如果该变量不存在即创建
echo $_SESSION['user_id'];//访问 session变量
$_SESSION = array();//清空所有session变量
session_destroy();//清除会话ID
// session end
// cookie start
setcookie(’user_id’,123);//创建一个cookie变量user_id=123
echo $_COOKIE['user_id'];//访问 cookie变量 和变通变量一样
setcookie(’user_id’,0,time()-1);//删除cookie变量
// codie end
// 该代码不可运行,只是将所有使用方法在这里列出,实际应该不同功能在不同页面使用,将在下面的例子中演示
?>
// session start
session_start(); // 开始一个会话,如果要使用session程序最前面一定要加上这句
$_SESSION['user_id'] = ‘123′;//给一个session 变量赋值,如果该变量不存在即创建
echo $_SESSION['user_id'];//访问 session变量
$_SESSION = array();//清空所有session变量
session_destroy();//清除会话ID
// session end
// cookie start
setcookie(’user_id’,123);//创建一个cookie变量user_id=123
echo $_COOKIE['user_id'];//访问 cookie变量 和变通变量一样
setcookie(’user_id’,0,time()-1);//删除cookie变量
// codie end
// 该代码不可运行,只是将所有使用方法在这里列出,实际应该不同功能在不同页面使用,将在下面的例子中演示
?>
cookie,session 是WEB应用程序保持用户状态的方法
cookie是保存的客户端的信息,由客户端连接服务器时发送到服务器的。
session是保存在服务端的信息,从这个角度session相对cookie更安全
当会话创建时服务器返回给客户端一个加密后的session id以标识用户身份,session id 一般保存在cookie当cookie不可用时由URL传递
上面的代码演示如何创建和使用session cookie变量

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