php sso单点登录实现代码

php
//index.php 应用程序页面
header('Content-Type:text/html; charset=utf-8');
$sso_address = 'http://2spaoku.com/sso/login.php'; //你SSO所在的域名
$callback_address = 'http://'.$_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']} 退出");
}else{
    echo '您还未登录 点此登录';
}
?>
<iframe src="?callback=" frameborder="0"  width="0" height="0">

//login.php SSO登录页面
header('Content-Type:text/html; charset=utf-8');
if(isset($_GET['logout'])){
    setcookie('sign','',-300);
    unset($_GET['logout']);
    header('location:index.php');
}

if(isset($_POST['username']) && isset($_POST['password'])){
    setcookie('sign',$_POST['username'],0,'');
    header("location:".$_POST['callback']."?sign={$_POST['username']}");
}

if(empty($_COOKIE['sign'])){
?>

}else{
    $query = http_build_query($_COOKIE);
    echo "系统检测到您已登录 {$_COOKIE['sign']} 授权 退出";
}
?>

//callback.php 回调页面用来设置跨域COOKIE
header('Content-Type:text/html; charset=utf-8');
if(empty($_GET)){
    exit('您还未登录');
}else{
    foreach($_GET as $key=>$val){
        setcookie($key,$val,0,'');
    }
    header("location:index.php");
}
?>

//connect.php 用来检测登录状态的页面，内嵌在页面的iframe中
header('Content-Type:text/html; charset=utf-8');
if(isset($_COOKIE['sign'])){
    $callback = urldecode($_GET['callback']);unset($_GET['callback']);
    $query = http_build_query($_COOKIE);
    $callback = $callback."?{$query}";
}else{
    exit;
}
?>