php跨域共享session

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