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本文實例講述了PHP簡單實現單點登錄功能。分享給大家供大家參考，具體如下：

1.準備兩個虛擬域名

127.0.0.1 www.openpoor.com
127.0.0.1 www.myspace.com

2.在openpoor的根目錄下創建以下文件

index.PHP

<?php
session_start();
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
<title>sync login</title>
</head>
<body>
<?php if(empty($_SESSION['username'])):?>
hello,游客;請先<a href="login.php" rel="external nofollow" >登錄</a><a href="http://www.myspace.com/index.php" rel="external nofollow" rel="external nofollow" >進入空間</a>
<?php else: ?>
hello,<?php echo $_SESSION['username']; ?>;<a href="http://www.myspace.com/index.php" rel="external nofollow" rel="external nofollow" >進入空間</a>
<?php endif; ?>
 <a href="http://www.openpoor.com/index.php" rel="external nofollow" >home</a>
</body>
</html>

<?php
session_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="用戶名"/>
 <input type="text" name="password" placeholder="密碼"/>
 <input type="submit" value="登錄"/>
</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的根目錄下創建如下文件

slogin文件完成session的設置

<?php
session_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

<?php
session_start();
if(!empty($_SESSION['username']))
{
  echo "歡迎來到".$_SESSION['username']."的空間";
}else{
  echo "請先登錄";
}
?>

4.Des.php的文件內容如下

<?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,"\0");
   if($_data[0]!=md5($decrypted)){
  return false;
   }
   return $decrypted;
 }
}
?>

當在openpoor登錄后將session信息傳到其他域名下的文件下進行處理，以script標簽包含的形式進行運行。

5.此時訪問www.openpoor.com和www.myspace.com都是未登錄狀態

PHP簡單實現單點登錄功能示例