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一个开发环境有多个网站，需要使用不同的session，解决方案很多。不过这次也高大上一把，用数据库存，方便以后扩展。
PostgreSQL版
首先是数据库的部分
create index concurrently idx_php_session_modify_time on php_session(modify_time);
--set_session(id,data)
create or replace function set_session(varchar,varchar) returns void as $set_session$
with upsert as (
update php_session
set modify_time = current_timestamp,sess_data = $2
where sess_id = $1
returning 1
)
insert into php_session (sess_id,modify_time,sess_data)
select $1,current_timestamp,$2
where not exists (
select 1 from upsert
);
$set_session$ language sql;
--get_session(id)
create or replace function get_session(varchar) returns varchar as $get_session$
select sess_data from php_session where sess_id = $1
$get_session$ language sql;
--del_session
create or replace function del_session(varchar) returns void as $del_session$
delete from php_session where sess_id = $1
$del_session$ language sql;
--gc_session
create or replace function gc_session() returns void as $del_session$
delete from php_session where modify_time < current_timestamp - interval '30 days'
$del_session$ language sql;
然后是PHP的部分
session_set_save_handler(
function ($savePath,$sessionName) {//open
return true;
},function () {//close
return true;
},function ($id) {//read
$sql = "select get_session($1)";
$stmt = pg_query_params(SESSION_CONN,$sql,array($id));
$result = pg_fetch_row($stmt);
return $result[0];
},function ($id,$data) {//write
$sql = "select set_session($1,$2)";
pg_query_params(SESSION_CONN,array($id,$data));
return true;
},function ($id) {//destroy
$sql = "select del_session($1)";
pg_query_params(SESSION_CONN,function ($maxlifetime) {//gc
//php needn't control the global session gc
return true;
}
);
register_shutdown_function('session_write_close');
?>
然后只要在session_start之前调用这个就可以了
至于SESSION_CONN，那是我定义的一个常量，表示一个指向session数据库的链接而已。
MySQL版
再总结一个针对MySQL的集成更多基础功能的例子：
表结构：
session信息存储到数据库的类：
/**
- @access private
- @var object 数据库连接
*/
private $_dbLink;
/**
- @access private
- @var string 保存session的表名
*/
Private $_sessionTable;
/**
- @access private
- @var string session名
*/
private $_sessionName;
/**
- @const 过期时间
*/
const SESSION_EXPIRE = 10;
public function __construct($dbLink,$sessionTable) {
if(!is_object($dbLink)) {
return false;
}
$this->_dbLink = $dbLink;
$this->_sessionTable = $sessionTable;
}
/**
- 打开
- @access public
- @param string $session_save_path 保存session的路径
- @param string $session_name session名
- @return integer
*/
public function open($session_save_path,$session_name) {
$this->_sessionName = $session_name;
return 0;
}
/**
- 关闭
- @access public
- @return integer
*/
public function close() {
return 0;
}
/**
- 关闭session
- @access public
- @param string $session_id session ID
- @return string
*/
public function read($session_id) {
$query = "SELECT value FROM {$this->_sessionTable} WHERE sid = {$session_id} AND UNIX_TIMESTAMP(expiration) + " . self::SESSION_EXPIRE . " > UNIX_TIMESTAMP(NOW())";
$result = $this->_dbLink->query($query);
if(!isset($value) || empty($value)) {
$value = "";
return $value;
}
$this->_dbLink->query("UPDATE {$this->_sessionTable} SET expiration = CURRENT_TIMESTAMP() WHERE sid = {$session_id}");
$value = $result->fetch_array();
$result->free();
return $value['value'];
}
/**
- 写入session
- @access public
- @param string $session_id session ID
- @param string $session_data session data
- @return integer
*/
public function write($session_id,$session_data) {
$query = "SELECT value FROM {$this->_sessionTable} WHERE sid = '{$session_id}' AND UNIX_TIMESTAMP(expiration) + " . self::SESSION_EXPIRE . " > UNIX_TIMESTAMP(NOW())";
$result = $this->_dbLink->query($query);
$result = $result->fetch_array();
if(!empty($result)) {
$result = $this->_dbLink->query("UPDATE {$this->_sessionTable} SET value = {$session_data} WHERE sid = {$session_id}");
}
else{
$result = $this->_dbLink->query("INSERT INTO {$this->_sessionTable} (sid,value) VALUES ('{$session_id}','{$session_data}')");
}
if($result){
return 0;
}
else{
return 1;
}
}
/**
- 销魂session
- @access public
- @param string $session_id session ID
- @return integer
*/
public function destroy($session_id) {
$result = $this->_dbLink->query("DELETE FROM {$this->_sessionTable} WHERE sid = '{$session_id}'");
if($result){
return 0;
}
else{
return 1;
}
}
/**
- 垃圾回收
- @access public
- @param string $maxlifetime session 最长生存时间
- @return integer
*/
public function gc($maxlifetime) {
$result = $this->_dbLink->query("DELETE FROM {$this->_sessionTable} WHERE UNIX_TIMESTAMP(expiration) < UNIX_TIMESTAMP(NOW()) - " . self::SESSION_EXPIRE);
if($result){
return 0;
}
else{
return 1;
}
}
}
$handler = new MySessionHandler($dbLink,$sessionTable);
session_set_save_handler($handler);
session_start();
$_SESSION['name'] = "test";
echo $_SESSION["name"];
//session_destroy();
（编辑：李大同）
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