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<?php
/**
http://zhidao.baidu.com/question/93806804.html
bool session_set_save_handler ( string open, string close, string read, string write, string destroy, string gc )
自定义Session存储方式
函数中一个参数对应一个函数，函数的名称自定但参数为固定格式,没有用到也要。
一、open(string save_path, string session_name)为session_start 参数string save_path session存取路径 string session_name传递session id的cookie名字。
function _session_open(string save_path, string name)
{
$db=mysql_connect("localhost","root","123456","tendao");
return TRUE;
}
二、close为session_close 无参数
在此对应关闭数据库，但一般网站中在此一般不要关闭。
三、read(key)为读取session键值。key对应session id。
四、write(key,date)其中的data对应设置的session变量，格式如下：
email_name|s:13:"qqtxt@163.com";member_id|s:1:"1";
五、destroy(key)注销session
在此程序段中对应删除对应记录项。
六、gc(expiry_time)清除过期session记录。
*/
class Session{
var $expiry=60;
var $db;
function __construct(){
$this->Session();
}
function Session(){
session_set_save_handler( array (& $this, "_session_open"),
array (& $this, "_session_close"),
array (& $this, "_session_read"),
array (& $this, "_session_write"),
array (& $this, "_session_destroy"),
array (& $this, "_session_gc")
);
}
/**
* open session handler
*
* @param string $save_path
* @param string $session_name
* @return boolen
*/
function _session_open($save_path, $session_name)
{
echo "start";
echo "<br>";
$this->db=mysql_connect("localhost","root","123456") or die("数据库连接失败！");
mysql_select_db("php_session",$this->db) or die("can't collect db");
return TRUE;
}
function _session_close(){
echo "end";
echo "<br>";
return true;
}
function _session_read($key){
echo "read";
echo "<br>";
$expiry=time();
$s_query=sprintf("select session_data from session where session_key= '%s' and session_expiry > %d " , $key, $expiry );
$result=mysql_query($s_query,$this->db);
$row=mysql_fetch_assoc($result);
if($row){
echo "yes";
echo "<br>";
return $row['session_data'];
}else{
echo "no";
echo "<br>";
return FALSE;
}
}
function _session_write($key,$data){
echo "<br>";
echo "write";
echo "<br>";
$expiry_time=time()+$this->expiry;
$s_query=sprintf("select session_data from session where session_key= '%s'", $key);
$result=mysql_query($s_query,$this->db);
if(mysql_num_rows($result)==0){
echo "add";
echo "<br>";
$s_query=sprintf("insert into session values('%s','%s', %d)",$key,$data,$expiry_time);
$result=mysql_query($s_query,$this->db);
}else{
$s_query=sprintf("update session set session_key='%s', session_data='%s',session_expiry=%d where session_key='%s'",$key,$data,$expiry_time,$key);
$result=mysql_query($s_query,$this->db);
}
return $result;
}
function _session_destroy($key){
echo "destroy";
echo "<br>";
$s_query=sprintf("delete from session where session_key= '%s'", $key);
$result=mysql_query($s_query,$this->db);
return $result;
}
function _session_gc($expiry_time){
echo "gc";
echo "<br>";
$expiry_time=time();
$s_query=sprintf("delete from session where session_expiry < %d", $expiry_time);
$result=mysql_query($s_query,$this->db);
return $result;
}
}
$_ses_=new Session();
session_start();
echo session_name."=>".session_id();
echo "<br>";
$_SESSION['time']=time()+1200;
echo strval(time()).'<br/>'.strval($_SESSION['time']);
?>
