php自定义session示例分享

class session
{
static function init()
{
session_set_save_handler(
array("session","open"),
array("session","close"),"read"),"write"),"destroy"),"gc")
);
}static function open($save_path,$session_name)
{
echo "session opening!
";
/*global $db,$REMOTE_ADDR;
$rs = $db->Execute("select * from Sessions where SessionID='".session_id()."'");
$arry=$rs->FetchRow();
if( $rs && $arry)
{
$db->Execute("update Sessions set SessionLast=NOW() where SessionID='".session_id()."'");
}
else
{
$query = "insert into Sessions set SessionID='".session_id()."',SessionName='$REMOTE_ADDR',SessionLast='NOW()'";
//echo $query;
$db->Execute($query);
}*/
return true;
}
static function close()
{
return(true);
}static function read($id)
{
echo "session reading now!
";
global $db;
return true;
$timenow = strftime("%Y-%m-%d %H:%M:%S",time());
$query = "select SessionData from Sessions where SessionID='$id' and SessionLast > '$timenow'";
$rs = $db->Execute($query);
if(list($SessionData) = $rs->FetchRow())
{
//echo $SessionData;
return $SessionData;
}
else
{
return false;
}
}static function write($id,$sess_data)
{
echo "session writing now!
";
global $db;
$rs = $db->Execute("select SessionID from Sessions where SessionID='$id'");
$num = $rs->RecordCount();
$unix_time = time()+MY_SESS_TIME;
//echo MY_SESS_TIME;
$dateleft = strftime("%Y-%m-%d %H:%M:%S",$unix_time);
if($num <= 0)
{
$sql = "insert into Sessions set SessionData='$sess_data',SessionName='".$_SERVER["REMOTE_ADDR"]."',SessionLast='$dateleft',SessionID='".session_id()."'";
}
else
{
$sql = "update Sessions set SessionData='$sess_data',SessionLast='$dateleft' where SessionID='$id'";
}
$db->Execute($sql);
}static function destroy($id)
{
echo "session destroying now!
";
global $db;
$sql = "DELETE FROM Sessions WHERE `SessionID` = '$id'";
$rs = $db->Execute($sql);
return $rs;
// $sess_file = "$sess_save_path/sess_$id";
//return(@unlink($sess_file));
}/*********************************************
* WARNING - You will need to implement some *
* sort of garbage collection routine here. *
*********************************************/
static function gc($maxlifetime)
{
echo "session maxlifetime now!
";
global $db;
$timenow = strftime("%Y-%m-%d %H:%M:%S",time());
$sql = "DELETE FROM `$table_sessions` WHERE `SessionLast` < '$timenow'";
return $sess_db->Execute($sql);
//echo "now gc!
";
return true;
}
// proceed to use sessions normally
}

include("session.class.php");
session::init();
session_start();
define("MY_SESS_TIME",3600); //SESSION 生存时长
$_SESSION["test"] = "abcdef";