session技术登陆+我的博客里面有核心解释

//销毁页面

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<?php
session_start();
//$_SESSION=array();
unset($_SESSION['username']);
?>
</body>
</html>

//判断是否登陆成功或失败页面

	<?php
header('content-type:text/html;charset=utf-8');

	session_start();
//获取输入的值
$username=$_POST['username'];
$password=$_POST['password'];
//链接数据库
$link=mysqli_connect('localhost','root','','test44');
//字符集
mysqli_set_charset($link,'utf8');
//安全化
$username=mysqli_real_escape_string($link,$username);
//然后是sql语句
$sql="select id from user2 where username='{$username}' and password='{$password}'";
$result=mysqli_query($link,$sql);
if($result&&mysqli_affected_rows($link)==1)
{
	$_SESSION['username']=$username;
	$_SESSION['islogin']=1;
	exit("<script>
			alert('登录成功');
			location.href='index.php';
		</script>");
}
else
{
	exit("<script>
			alert('登录失败');
			location.href='login.php';
		</script>");
}
?>

//登陆后页面

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<?php
header('content-type:text/html;charset=utf-8');
session_start();
if (empty($_SESSION['islogin'])||($_SESSION['islogin']!=1)) {
	# code...
	exit("<script>
			alert('登录失败');
			location.href='login.php';
		</script>");
}
echo "欢迎您".$_SESSION['username']."<br />";
echo  "<a href='logout.php'>注销</a>";
?>
</body>
</html>

//登陆页面

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<h1>登陆页面</h1>
	<form action="doAction.php" method="post">
		<table border="1" cellpadding="0" cellspacing="0" width="80%" bgcolor="#abcdef">
			<tr>
				<td>用户名</td>
				<td><input type="text" name="username" id=""></td>
			</tr>
			<tr>
				<td>密码</td>
				<td><input type="password" name="password" id="" /></td>
			</tr>
			<tr colspan="2">
				<td><input type="submit" name="islogin" value="登陆"></td>
			</tr>
		</table>
	</form>
</body>
</html>

//退出页面

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<?php
session_start();
$_SESSION=array();
session_destroy();
exit("<script>
			alert('已退出');
			location.href='login.php';
		</script>");
?>
</body>
</html>

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