php实现单点登录实例

1.准备两个虚拟域名

127.0.0.1 www.a.com
127.0.0.1 www.b.com

2.在a的根目录下创建以下文件

//index.php

<?php
session_start();
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8"/>
    <title>sync login</title>
</head>
<body>

<?php if(empty($_SESSION['username'])):?>
    <p>hello,游客;请先<a href="login.php">登录</a></p>
    <p><a href="http://www.b.com/index.php">进入空间</a></p>
<?php else: ?>
    <p>hello,<?php echo $_SESSION['username']; ?>;<a href="http://www.b.com/index.php">进入空间</a></p>
<?php endif; ?>
<a href="http://www.a.com/index.php">home</a>
</body>
</html>

//login.php
<?php
session_start();
if(!empty($_POST['username'])){
    require './Des.php';
    $_SESSION['username'] = $_POST['username'];
    $redirect = 'http://www.a.com/index.php';
    header('Location:http://www.a.com/sync.php?redirect='.urlencode($redirect).'&code='.Des::encode($_POST['username'],'a'));
    exit;
}
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8"/>
    <title>sync login</title>
</head>
<body>
<form action="" method="post">
    <input type="text" name="username" placeholder="用户名"/>
    <input type="text" name="password" placeholder="密码"/>
    <input type="submit" value="登录"/>
</form>
</body>
</html>

//sync.php
<?php
$redirect = empty($_GET['redirect']) ? 'www.a.com' : $_GET['redirect'];
if (empty($_GET['code'])) {
    header('Loaction:http://' . urldecode($redirect));
    exit;
}

$apps = array(
    'www.b.com/slogin.php'
);
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8"/>
    <?php foreach ($apps as $v): ?>
        <script type="text/javascript" src="http://<?php echo $v . '?code=' . $_GET['code'] ?>"></script>
    <?php endforeach; ?>
    <title>passport</title>
</head>
<body>
<script type="text/javascript">
    window.onload = function () {
        location.replace('<?php echo $redirect; ?>');
    }
</script>
</body>
</html>

//Des.php
//当在www.a.com登录后将session信息传到其他域名下的文件下进行处理，以script标签包含的形式进行运行。
<?php

class Des
{
    /**
     * 简单对称加密算法之加密
     * @param String $string 需要加密的字串
     * @param String $skey   加密EKY
     * @return String
     */
    public static function encode($string = '', $skey = 'cxphp')
    {
        $strArr   = str_split(base64_encode($string));
        $strCount = count($strArr);
        foreach (str_split($skey) as $key => $value) {
            $key < $strCount && $strArr[$key] .= $value;
        }
        return str_replace(array('=', '+', '/'), array('O0O0O', 'o000o', 'oo00o'), join('', $strArr));
    }

    /**
     * 简单对称加密算法之解密
     * @param String $string 需要解密的字串
     * @param String $skey   解密KEY
     * @return String
     */
    public static function decode($string = '', $skey = 'cxphp')
    {
        $strArr   = str_split(str_replace(array('O0O0O', 'o000o', 'oo00o'), array('=', '+', '/'), $string), 2);
        $strCount = count($strArr);
        foreach (str_split($skey) as $key => $value) {
            $key <= $strCount && isset($strArr[$key]) && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
        }
        return base64_decode(join('', $strArr));
    }
}

3.在www.b.com的根目录下创建如下文件

//slogin.php文件 完成session的设置
<?php
session_start();
header('Content-Type:text/javascript; charset=utf-8');
if(!empty($_GET['code'])){
    require './Des.php';
    $username = Des::decode($_GET['code'],'a');
    if(!empty($username)){
        header('P3P: CP="CURa ADMa DEVa PSAo PSDo OUR BUS UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"');
        $_SESSION['username'] = $username;
    }
}
?>

//index.php
<?php
session_start();
if(!empty($_SESSION['username']))
{
    echo "欢迎来到".$_SESSION['username']."的空间";
}else{
    echo "请先登录";
}
?>

4.此时访问www.a.com和www.b.com都是未登录状态
登录后两个域名下都是登录状态

到此我们实现了一个简单的单点登录。

done!

php实现单点登录实例

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