php的sso单点登陆实现方法，代码实例！

1.项目A：

  a.首页登陆页面index.php（是你当前项目首页）

<?php  
header('Content-Type:text/html; charset=utf-8');  
$sso_address = 'http://www.sso.com/login.php'; //你SSO所在的域名,不是当前项目地址  
$callback_address = 'http://'.$_SERVER['HTTP_HOST']  
                    .str_replace('index.php','',$_SERVER['SCRIPT_NAME'])  
                    .'callback.php'; //callback地址用于回调设置cookie
if(isset($_COOKIE['sign'])){
    exit("欢迎您{$_COOKIE['sign']} <a href='{$sso_address}?logout=1'>退出</a>");  
}else{  
    echo '您还未登陆 <a href="'.$sso_address.'?callback='.$callback_address.'">点此登陆</a>';
}  
?>

 

 b.当前项目的中间件用来赋值cookie和清空cookie的文件callback.php

<?php  
header('Content-Type:text/html; charset=utf-8');  
if(empty($_GET)){ 
    exit('您还未登陆');  
}else{  
    foreach($_GET as $key=>$val){  
        setcookie($key,$val,0,'');  
    }  
    header("location:index.php");  
}

 

2.SSO服务器：

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

if(isset($_GET['logout'])){ 
    setcookie('sign','',-300);
    $callback = $_COOKIE['callback'];  
    unset($_GET['logout']);  
    header("location:$callback.?sign"); //注意替换成你项目的域名
} 
 
if(isset($_POST['username']) && isset($_POST['password'])){ 
    setcookie('sign',$_POST['username'],0,'');
    setcookie('callback',$_POST['callback'],0,'');  
    header("location:".$_POST['callback']."?sign={$_POST['username']}&callback={$_POST['callback]}");  
} 
 
if(empty($_COOKIE['sign'])){
?> 
 
<form method="post">  
<p>用户名：<input type="text" name="username" /></p>  
<p>密  码：<input type="password" name="password" /></p>  
<input type="hidden" name="callback" value="<?php echo $_GET['callback']; ?>" />  
<input type="submit" value="登陆" />  
</form> 
 
 
<?php  
}else{  
    $query = http_build_query($_COOKIE);  
    echo "系统检测到您已登陆 {$_COOKIE['sign']} <a href='?logout'>退出</a>";  
}