public function getPersistence()
    {
        if (null === $this->persistence) {
            $this->persistence = (isset($this->options['persistence']) && $this->options['persistence'] == true);
        }
        
        return $this->persistence;
    }
public function getPersistence()
    {
        if (null === $this->persistence) {
            $this->persistence = (isset($this->options['persistence']) && $this->options['persistence'] == true);
        }
        
        return $this->persistence;
    }
public function getPersistence ( ) { if ( null === $ this -> persistence ) { $ this -> persistence = ( isset ( $ this -> options [ 'persistence' ] ) && $ this -> options [ 'persistence' ] == true ) ; } return $ this -> persistence ; }
Check persistance.

@return bool
Check persistance .