<?php
class Session_class implements SessionHandlerInterface
{
  private $db;
  private function logx($str)
  {
	$log = date('Y-m-d H:i:s') . $str;
    file_put_contents(__DIR__ . '/log.txt', $log . PHP_EOL, FILE_APPEND);

  }
  public function open($savePath, $sessionName)
  {	
    Session_class::logx("$savePath, $sessionName");
    $this->db = mysqli_connect('localhost','root','12345','restservice'); 
    if (!$this->db) throw new Exception(mysqli_connect_error());
    return TRUE;
  }
  public function close()
  {
	mysqli_close($this->db);  
    return TRUE;
  }
  public function read($id)
  {
  
	$result = mysqli_query($this->db,'SELECT Session_Data FROM Session WHERE Session_Id = "'.$id.'"');
    if($row = mysqli_fetch_assoc($result)){
	  Session_class::logx(' чтение сессии result='.$row['Session_Data']);
      return $row['Session_Data'];
    }else{
	  Session_class::logx(' чтение сессии result=');
      return "";
    }
  }
  public function write($id,$data)
  {
     
        $DateTime = date('Y-m-d H:i:s');
        $NewDateTime = date('Y-m-d H:i:s',strtotime($DateTime.' + 1 hour'));	    
		$sql = 'REPLACE INTO Session SET Session_Id = "'.$id.'", Session_Expires = "'.$NewDateTime.'", Session_Data = "'.$data.'"';
		Session_class::logx(' '.$sql);
		$result = mysqli_query($this->db, $sql);
		Session_class::logx(' Запись сессии result='.$result);
        if($result){
            return true;
        }else{
            return false;
        }

  }
    public function destroy($id)
    {
		$result=mysqli_query($this->db,'DELETE FROM Session WHERE Session_Id = "'.$id.'"');
		Session_class::logx(' Уничтожение сессии result='.$result);
        if($result){
            return true;
        }else{
            return false;
        }
    }
    public function gc($maxlifetime)
    {
        $result = mysqli_query($this->db,'DELETE FROM Session WHERE ((UNIX_TIMESTAMP(Session_Expires) + '.$maxlifetime.') < '.$maxlifetime.')');
		Session_class::logx(' Очистка мусора result='.$result);

        if($result){
            return true;
        }else{
            return false;
        }		
    }
}
$sess=new Session_class();
session_set_save_handler($sess, true);
session_start();
$_SESSION['TEST']='TEST';
?>

2020-04-14 19:34:19C:\PHPServer74\tmp, PHPSESSID
2020-04-14 19:34:19 чтение сессии result=
2020-04-14 19:34:19 REPLACE INTO Session SET Session_Id = "5p9ukfbfhu0rah0vpb53unvc9i", Session_Expires = "2020-04-14 20:34:19", Session_Data = "TEST|s:4:"TEST";"
2020-04-14 19:34:19 Запись сессии result=