单点登录实现方法

来源：互联网发布：查看端口8080的命令编辑：程序博客网时间：2024/06/10 11:49

session的共享

1、首先把session_id的值赋值给cookie，保存在客户端。

2、其次把session_id保存在服务器群都能访问的地方，比如数据库、memcache、radis等等之中

3、根据cookie获取session_id，但是二级域名不同，不能跨域访问cookie，所以，要在php.ini中设置一下

ini_set('session.cookie_domain', '.a.com');

4、session放在数据库中

CREATE TABLE sessions (session_id varchar(32) NOT NULL,session_last_access int(10) unsigned,session_data text,)PRIMARY KEY (session_id)

<?php $gb_DBHOSTname    = "127.0.0.1"; //主机的名称或是IP地址$gb_DBname        = "dbname"; //数据库名称$gb_DBuser        = "username"; //数据库用户名称$gb_DBpass        = "pwd"; //数据库密码$gb_COOKIE_DOMAIN = '.a.com';$SESS_DBH         = "";$SESS_LIFE = get_cfg_var("session.gc_maxlifetime"); //得到session的最大有效期。 session_id(); //不使用 GET/POST 变量方式ini_set('session.use_trans_sid', 0); //设置垃圾回收最大生存时间ini_set('session.gc_maxlifetime', 13600); //使用 COOKIE 保存 SESSION ID 的方式ini_set('session.use_cookies', 1);ini_set('session.cookie_path', '/'); //多主机共享保存 SESSION ID 的 COOKIEini_set("session.cookie_domain", $gb_COOKIE_DOMAIN);//将 session.save_handler 设置为 user，而不是默认的 files session_module_name('user');function sess_open($save_path, $session_name) {    global $gb_DBHOSTname, $gb_DBname, $gb_DBuser, $gb_DBpass, $SESS_DBH;    if (!$SESS_DBH = mysql_pconnect($gb_DBHOSTname, $gb_DBuser, $gb_DBpass)) {        die('MySQL Error');    }    mysql_query("SET character_set_connection=utf8, character_set_results=utf8, character_set_client=binary", $SESS_DBH);    if (!mysql_select_db($gb_DBname, $SESS_DBH)) {        die('MySQL Error');    }    return true;}function sess_close() {    global $SESS_DBH;    //$SESS_DBH->Close();    return true;}function sess_read($key) {    global $SESS_DBH, $SESS_LIFE;//      var_dump($SESS_DBH);    $qry = "select session_data from sessions where session_id = '$key' ";    $qid = mysql_query($qry, $SESS_DBH);//      var_dump($qid);    if (list ($value) = mysql_fetch_row($qid)) {        return $value;    }    return false;}function sess_write($key, $val) {    global $SESS_DBH, $SESS_LIFE;    $session_last_access = time();    $value = $val;    $qry = "insert into  sessions values('$key',$session_last_access,'$value')";    $qid = mysql_query($qry, $SESS_DBH);    if (!$qid) {        $qry = "update sessions set session_last_access=$session_last_access, session_data='$value' where session_id='$key' ";        $qid = mysql_query($qry, $SESS_DBH);    }    return $qid;}function sess_destroy($key) {    global $SESS_DBH;    $qry = "delete from sessions where session_id = '$key'";    $qid = mysql_query($qry, $SESS_DBH);    return $qid;}function sess_gc($maxlifetime) {    global $SESS_DBH;    $old = time() - $maxlifetime;    $old = mysql_real_escape_string($old);    $qry = "delete from sessions where session_last_access < " . $old;    $qid = mysql_query($qry, $SESS_DBH);    return mysql_affected_rows($SESS_DBH);}session_module_name();session_set_save_handler("sess_open", "sess_close", "sess_read", "sess_write","sess_destroy", "sess_gc");session_start(); ?>

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