session/Database.php
public function gc($maxLifetime)
    {
        try {
            return (bool) $this->db->from($this->table)
                    ->where($this->columns['expires'])->lt(time())
                    ->delete();
        } catch (PDOException $e) {
            return false;
        }
    }
public function gc($maxLifetime)
    {
        try {
            return (bool) $this->db->from($this->table)
                    ->where($this->columns['expires'])->lt(time())
                    ->delete();
        } catch (PDOException $e) {
            return false;
        }
    }
public function gc ( $ maxLifetime ) { try { return ( bool ) $ this -> db -> from ( $ this -> table ) -> where ( $ this -> columns [ 'expires' ] ) -> lt ( time ( ) ) -> delete ( ) ; } catch ( PDOException $ e ) { return false ; } }
Garbage collector.

@param   int      $maxLifetime  Lifetime in secods

@return  boolean
Garbage collector .