src/Polygon.php
public function getLngs(): array
    {
        $lngs = [];

        foreach ($this->points as $point) {
            /** @var Coordinate $point */
            $lngs[] = $point->getLng();
        }

        return $lngs;
    }
public function getLngs(): array
    {
        $lngs = [];

        foreach ($this->points as $point) {
            /** @var Coordinate $point */
            $lngs[] = $point->getLng();
        }

        return $lngs;
    }
Return all polygon point's longitudes.

@return float[]