跨同一服务器上多个域的会话共享

我听说在同一服务器上跨多个域共享会话的最佳方法是使用自定义php会话处理程序. (即，域名不同，例如abc.com，xyz.com，但单个应用程序.)

但是，在我尝试了它之后，当我尝试从其他域读取cookie值时，即使是使用SAME DATABASE ON 1 SERVER的自定义php会话处理程序也无法共享会话. (在相同的域上可以正常使用)

这是我的自定义会话处理程序，请检查或修复此处缺少的内容.因为我已经尝试了一个星期.无法正常工作



SESSION_INCLUDE.PHP

I heard the best method to share session across multiple domains on same server is to use custom php session handler. (ie, domain name different like abc.com, xyz.com but single application.)

But after i tried it, even custom php session handler that using SAME DATABASE ON 1 SERVER can''t share session, when i tried to read cookie value from different domain. (it works ok on same domain)

Here''s my custom session handler, Please kindly check or fix if something missing here. because i''ve tried it for a week now. can''t get it to work



SESSION_INCLUDE.PHP

<?php 
 
// config 
$m_host = "localhost"; //MySQL Host 
$m_user = "db_user"; //MySQL User 
$m_pass = "db_pass"; //MySQL Pass 
$m_db   = "db_name"; //MySQL Database
$table  = "sess_data";
 
$session_expire = 600; // Session expire time, in seconds (minutes * 60 = seconds) 
 
$gc_probability = 100; // Probability that the garbage collection function will be called. 50% chance by default 
 
ini_set("session.gc_probability",$gc_probability); 
 
/* Open function; Opens/starts session 
 
   Opens a connection to the database and stays open until specifically closed 
   This function is called first and with each page load */ 
 
function open ($s,$n) // do not modify function parameters 
{ 
  global $session_connection, $m_host, $m_user, $m_pass, $m_db; 
  $session_connection = mysql_pconnect($m_host,$m_user,$m_pass); 
  mysql_select_db($m_db,$session_connection); 
  return true; 
} 
 
/* Read function; downloads data from repository to current session 
 
   Queries the mysql database, unencrypts data, and returns it. 
   This function is called after ''open'' with each page load. */ 
function read ($id) // do not modify function parameters 
{ 
  global $session_connection,$session_read,$table; 
  $query = "SELECT data FROM `$table` WHERE id=\"{$id}\""; 
  $res = mysql_query($query,$session_connection); 
  if(mysql_num_rows($res) != 1) return ""; // must return string, not ''false'' 
  else 
  { 
    $session_read = mysql_fetch_assoc($res); 
    $session_read["data"] = base64_decode($session_read["data"]); 
    return $session_read["data"]; 
  } 
} 
function write ($id,$data) // do not modify function parameters 
{ 
  if(!$data) { return false; } 
  global $session_connection, $session_read, $session_expire, $table; 
  $expire = time() + $session_expire; 
  $data = mysql_real_escape_string(base64_encode($data)); 
  if($session_read) $query = "UPDATE `$table` SET data=\"{$data}\", expire=\"{$expire}\" WHERE id=\"{$id}\""; 
  else $query = "INSERT INTO sess_data SET id=\"{$id}\", data=\"{$data}\", expire=\"{$expire}\""; 
  mysql_query($query,$session_connection); 
  return true; 
} 
function close () 
{ 
  global $session_connection; 
  mysql_close($session_connection); 
  return true; 
} 
function destroy ($id) // do not modify function parameters 
{ 
  global $session_connection,$table; 
  $query = "DELETE FROM `$table` WHERE id=\"{$id}\""; 
  mysql_query($query,$session_connection); 
  return true; 
}
function gc ($expire) 
{ 
  global $session_connection,$table; 
  $query = "DELETE FROM `$table` WHERE expire < ".time(); 
  mysql_query($query,$session_connection); 
}
// Set custom handlers 
session_set_save_handler ("open", "close", "read", "write", "destroy", "gc"); 
 
// Start session 
session_start(); 
?>

//MySQL数据库表

// MySQL Database Table

create table sess_data (
id2 int not null auto_increment,
id text not null,
data text,
expire int not null,
primary key(id2)
);