php的sso單點登錄實現方法，代碼實例！

1.首頁登錄頁面index.php（是你當前項目首頁）

<?php  
header('Content-Type:text/html; charset=utf-8');  
$sso_address = 'http://www.mysso.com/sso/login.php'; //你SSO所在的域名,不是當前項目地址  
$callback_address = 'http://'.$_SERVER['HTTP_HOST']  
                    .str_replace('index.php','',$_SERVER['SCRIPT_NAME'])  
                    .'callback.php'; //callback地址用於回調設置cookie
if(isset($_COOKIE['sign'])){
    exit("歡迎您{$_COOKIE['sign']} <a href='{$sso_address}?logout=1'>退出</a>");  
}else{  
    echo '您還未登錄 <a href="'.$sso_address.'?callback='.$callback_address.'">點此登錄</a>';
}  
?> 
<iframe src="<?php echo $sso_address ?>?callback=<?php echo $callback_address ?>" frameborder="0"  width="0" height="0"></iframe>

2.當前項目的中間件用來賦值cookie和清空cookie的文件callback.php

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

3.很重要的文件login.php（是sso登錄也要放在第三方網站下面）

<?php  
header('Content-Type:text/html; charset=utf-8');  
if(isset($_GET['logout'])){ 
    setcookie('sign','',-300);  
    unset($_GET['logout']);  
    header('location:http://www.zjx.com/sso/callback.php?sign'); //注意替換成你項目的域名
} 
 
if(isset($_POST['username']) && isset($_POST['password'])){ 
    setcookie('sign',$_POST['username'],0,'');  
    header("location:".$_POST['callback']."?sign={$_POST['username']}");  
} 
 
if(empty($_COOKIE['sign'])){
?> 
 
<form method="post">  
<p>用戶名：<input type="text" name="username" /></p>  
<p>密  碼：<input type="password" name="password" /></p>  
<input type="hidden" name="callback" value="<?php echo $_GET['callback']; ?>" />  
<input type="submit" value="登錄" />  
</form> 
 
 
<?php  
}else{  
    $query = http_build_query($_COOKIE);  
    echo "系統檢測到您已登錄 {$_COOKIE['sign']} <a href='{$_GET['callback']}?{$query}''>授權</a> <a href='?logout'>退出</a>";  
}

 

原理:

根據你第三方登錄頁面輸入的信息，判斷是否用戶正確信息，然后記錄到cookie里面，然后帶上加密的sign，跳轉回去中間件文件callback.php,然后解密，進行當前項目的cookie進行賦值，然后跳轉回首頁，並且實現登錄了！