php自定义session示例分享

下面为session类的代码
复制代码 代码如下:
class session
{
 static function init()
 {
  session_set_save_handler(
    array("session","open"),
    array("session","close"),
    array("session","read"),
    array("session","write"),
    array("session","destroy"),
    array("session","gc")
  );
 }

 static function open($save_path,$session_name)
 {
  echo "session opening!
";
  
  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', SessionName='".$_SERVER["REMOTE_ADDR"]."', SessionLast='$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));
 }

 
 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
}

使用方法
复制代码 代码如下:
include("session.class.php");
session::init();
session_start();
define("MY_SESS_TIME", 3600); //SESSION 生存时长
$_SESSION["test"] = "abcdef";