public function save():bool
    {
        $_SESSION = $this->session;
        return (0 === count(array_diff($this->session, $_SESSION)))? true : false;
    }
public function save():bool
    {
        $_SESSION = $this->session;
        return (0 === count(array_diff($this->session, $_SESSION)))? true : false;
    }
public function save ( ) : bool { $ _SESSION = $ this -> session ; return ( 0 === count ( array_diff ( $ this -> session , $ _SESSION ) ) ) ? true : false ; }
Save the modification about sessions items
@return bool true if iumio session is the same as PHP SESSION, false for an error
($_SESSION & $this->session not the same)
Save the modification about sessions items