<?php 
session_start(); 
$_SESSION['username']="zhuzhao"; 
?>

<?php 
session_start(); 
echo $_SESSION['username']; 
?>

php session 检测和注销
?phpsession_start();$_SESSION['username']="zhuzhao";??phpsession_start();unset($_SESSION['username']);if(isset($_SESSION['username']))echo"username已经存在";elseecho"username不存在";?

php session处理的定制
user-define-session-inc.php文件代码：?phpfunctionmysession_open($save_path,$session_name){@mysql_connect("localhost","root","1981427")//选择数据库之前需要先连接数据库服务器ordie

php session应用实例 登录验证
htmlheadtitleLogin/titlemetahttp-equiv="Content-Type"content="text/html;charset=gb2312"/headbodyformname="form1"method="post"action="login.php"tablewidth="300"border="0"align="center"cellpadding="2"ce