cookie、session登陆 - php入门

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实例

<?php
//判断用户是否已经登录
if( isset($_COOKIE['username']) && $_COOKIE['username'] === 'hms'){
    echo '<script>alert("你已经登录，请不要重复登录！");location.href="admin.php";</script>';
}
?>
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户登录</title>
</head>
<body>
    <h3>用户登录</h3>
    <form action="check.php" method="post" onsubmit="return isEmpty()">
        <p>
            <label for="email">邮箱：</label>
            <input type="email" name="email" id="email">
        </p>
        <p>
            <label for="password">密码：</label>
            <input type="password" name="password" id="password">
        </p>
        <p>
           <button>提交</button>
        </p>
    </form>
    <script>
        // 非空验证
        function isEmpty() {
            var email = document.getElementById('email').value;
            var password = document.getElementById('password').value;
            if(email.length === 0 || password.length === 0){
                alert('邮箱和密码不能为空！');
                return false;
            }
        }
    </script>
</body>
</html>



------------------------------------------
<?php
//防止重复登录的检查
if( isset($_COOKIE['username']) && $_COOKIE['username'] === 'hms'){
    echo '<script>alert("已经登录，请不要重复登录");location.href="admin.php";</script>';
}
//连接数据库
require  __DIR__.'/public/include/connect.php';

$email = $_POST['email'];
$password = sha1($_POST['password']);

//到用户user表中进行验证
  $sql = 'SELECT * FROM `userInfo` WHERE `email` = :email AND `password` = :password LIMIT 1';
//  $sql = 'SELECT * FROM `userInfo` WHERE `email` = :email LIMIT 1';
//    创建语句对象，预处理对象
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':email',$email,PDO::PARAM_STR);
$stmt->bindParam(':password',$password,PDO::PARAM_STR);
$stmt->execute();
//fetch()成功返回数组，失败返回false
$user = $stmt->fetch(PDO::FETCH_ASSOC);
if($user === false){
    echo '<script>alert("登录失败，请检查");history.back();</script>';
    die; // 中断当前脚本
}
//登录成功
setcookie('username',$user['username']);
echo '<script>alert("登录成功");location.assign("admin.php");</script>';







-------------------------------------------------------------------------
<?php
//判断用户是否已经登录
if( isset($_COOKIE['username']) && $_COOKIE['username'] === 'hms'):
?>
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>后台管理</title>
</head>
<body>
    <h3>后台管理</h3>
    <p>
        欢迎：<?php echo $_COOKIE['username'];?>
    </p>
    <p>
    <a href="logout.php">
        退出：<?php echo $_COOKIE['username'];?>
    </a>
    </p>
</body>
</html>
<?php else: ?>
    echo '<script>alert("请先登录");location.href="login.php";</script>';
<?php endif; ?>


----------------------------------------------------------------------------


<?php
//必须已经登录才允许退出
if( isset($_COOKIE['username']) && $_COOKIE['username'] === 'hms'){
    setcookie('username',null,time()-3600);
    echo '<script>alert("退出成功");location.href="login.php";</script>';
} else {
    echo '<script>alert("请先登录");location.href="login.php";</script>';
}




session
----------------------------------------------------------------------------
<?php
session_start();
//判断用户是否已经登录
if( isset($_SESSION['username']) && $_SESSION['username'] === 'hms'){
    echo '<script>alert("你已经登录，请不要重复登录！");location.href="admin.php";</script>';
}
?>
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户登录</title>
</head>
<body>
    <h3>用户登录</h3>
    <form action="check.php" method="post" onsubmit="return isEmpty()">
        <p>
            <label for="email">邮箱：</label>
            <input type="email" name="email" id="email">
        </p>
        <p>
            <label for="password">密码：</label>
            <input type="password" name="password" id="password">
        </p>
        <p>
           <button>提交</button>
        </p>
    </form>
    <script>
        // 非空验证
        function isEmpty() {
            var email = document.getElementById('email').value;
            var password = document.getElementById('password').value;
            if(email.length === 0 || password.length === 0){
                alert('邮箱和密码不能为空！');
                return false;
            }
        }
    </script>
</body>
</html>


------------------------------------------------------------------------------

<?php
session_start();
//防止重复登录的检查
if( isset($_SESSION['username']) && $_SESSION['username'] === 'hms'){
    echo '<script>alert("已经登录，请不要重复登录");location.href="admin.php";</script>';
}
//连接数据库
require  __DIR__.'/public/include/connect.php';

$email = $_POST['email'];
$password = sha1($_POST['password']);

//到用户user表中进行验证
  $sql = 'SELECT * FROM `userInfo` WHERE `email` = :email AND `password` = :password LIMIT 1';
//  $sql = 'SELECT * FROM `userInfo` WHERE `email` = :email LIMIT 1';
//    创建语句对象，预处理对象
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':email',$email,PDO::PARAM_STR);
$stmt->bindParam(':password',$password,PDO::PARAM_STR);
$stmt->execute();
//fetch()成功返回数组，失败返回false
$user = $stmt->fetch(PDO::FETCH_ASSOC);
if($user === false){
    echo '<script>alert("登录失败，请检查");history.back();</script>';
    die; // 中断当前脚本
}
//登录成功
//setcookie('username',$user['username']);
$_SESSION['username'] = $user['username'];
echo '<script>alert("登录成功");location.assign("admin.php");</script>';



-----------------------------------------------------------------------------
<?php
session_start();
//判断用户是否已经登录
if( isset($_SESSION['username']) && $_SESSION['username'] === 'hms'):
?>
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>后台管理</title>
</head>
<body>
    <h3>后台管理</h3>
    <p>
        欢迎：<?php echo $_SESSION['username'];?>
    </p>
    <p>
    <a href="logout.php">
        退出：<?php echo $_SESSION['username'];?>
    </a>
    </p>
</body>
</html>
<?php else: ?>
    echo '<script>alert("请先登录");location.href="login.php";</script>';
<?php endif; ?>


-----------------------------------------------------------------------------

<?php
session_start();
//必须已经登录才允许退出
if( isset($_SESSION['username']) && $_SESSION['username'] === 'hms'){
//    setcookie('username',null,time()-3600);
    session_destroy();
    echo '<script>alert("退出成功");location.href="login.php";</script>';
}
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2019-03-14 11:30:15