public function getCenterLng()
    {
        return (is_null($this->getSouthWest()) || is_null($this->getNorthEast()))
            ? null
            : floatval(($this->getSouthWest()->getLng() + $this->getNorthEast()->getLng()) / 2);
    }
public function getCenterLng()
    {
        return (is_null($this->getSouthWest()) || is_null($this->getNorthEast()))
            ? null
            : floatval(($this->getSouthWest()->getLng() + $this->getNorthEast()->getLng()) / 2);
    }
public function getCenterLng ( ) { return ( is_null ( $ this -> getSouthWest ( ) ) || is_null ( $ this -> getNorthEast ( ) ) ) ? null : floatval ( ( $ this -> getSouthWest ( ) -> getLng ( ) + $ this -> getNorthEast ( ) -> getLng ( ) ) / 2 ) ; }
Get the longitude of the center of the zone
@return integer
Get the longitude of the center of the zone