本文实例讲述了PHP简单实现单点登录功能。分享给大家供大家参考，具体如下：
1.准备两个虚拟域名
127.0.0.1 www.openpoor.com127.0.0.1 www.myspace.com
2.在openpoor的根目录下创建以下文件
index.PHP
<?phpsession_start();?><!DOCTYPE html><html><head><meta charset="UTF-8"/><title>sync login</title></head><body><?php if(empty($_SESSION["username"])):?>hello,游客;请先<a href="login.php" rel="external nofollow" >登录</a><a href="http://www.myspace.com/index.php" rel="external nofollow" rel="external nofollow" >进入空间</a><?php else: ?>hello,<?php echo $_SESSION["username"]; ?>;<a href="http://www.myspace.com/index.php" rel="external nofollow" rel="external nofollow" >进入空间</a><?php endif; ?> <a href="http://www.openpoor.com/index.php" rel="external nofollow" >home</a></body></html>
login.php
<?phpsession_start();if(!empty($_POST["username"])){ require "../Des.php"; $_SESSION["username"] = $_POST["username"]; $redirect = "http://www.openpoor.com/index.php"; header("Location:http://www.openpoor.com/sync.php?redirect=".urlencode($redirect)."&code=".Des::encrypt($_POST["username"],"openpoor"));exit;}?><!DOCTYPE html><html><head><meta charset="UTF-8"/><title>sync login</title></head><body><form action="" method="post"> <input type="text" name="username" placeholder="用户名"/> <input type="text" name="password" placeholder="密码"/> <input type="submit" value="登录"/></form></body></html>sync.php
<?php$redirect = empty($_GET["redirect"]) ? "www.openpoor.com" : $_GET["redirect"];if(empty($_GET["code"])){ header("Loaction:http://".urldecode($redirect)); exit;}$apps = array( "www.myspace.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 $redirect; ?>");}</script></body></html>3.在myspace的根目录下创建如下文件
slogin文件 完成session的设置
<?phpsession_start();header("Content-Type:text/javascript; charset=utf-8");if(!empty($_GET["code"])){ require "../Des.php"; $username = Des::decrypt($_GET["code"],"openpoor"); 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"] = $username; }}?>index.php
<?phpsession_start();if(!empty($_SESSION["username"])){ echo "欢迎来到".$_SESSION["username"]."的空间";}else{ echo "请先登录";}?>4.Des.php的文件内容如下
<?php/** *@see Yii CSecurityManager; */class Des{ public static function encrypt($data,$key){ $module=mcrypt_module_open("des","", MCRYPT_MODE_CBC,""); $key=substr(md5($key),0,mcrypt_enc_get_key_size($module)); srand(); $iv=mcrypt_create_iv(mcrypt_enc_get_iv_size($module), MCRYPT_RAND); mcrypt_generic_init($module,$key,$iv); $encrypted=$iv.mcrypt_generic($module,$data); mcrypt_generic_deinit($module); mcrypt_module_close($module); return md5($data)."_".base64_encode($encrypted); } public static function decrypt($data,$key){ $_data = explode("_",$data,2); if(count($_data)<2){ return false; } $data = base64_decode($_data[1]); $module=mcrypt_module_open("des","", MCRYPT_MODE_CBC,""); $key=substr(md5($key),0,mcrypt_enc_get_key_size($module)); $ivSize=mcrypt_enc_get_iv_size($module); $iv=substr($data,0,$ivSize); mcrypt_generic_init($module,$key,$iv); $decrypted=mdecrypt_generic($module,substr($data,$ivSize,strlen($data))); mcrypt_generic_deinit($module); mcrypt_module_close($module); $decrypted = rtrim($decrypted," "); if($_data[0]!=md5($decrypted)){ return false; } return $decrypted; }}?>当在openpoor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。
5.此时访问www.openpoor.com和www.myspace.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。
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希望本文所述对大家PHP程序设计有所帮助。
