在多边形PHP中查找点

这是我从另一种语言转换为PHP的功能：

$vertices_x = array(37.628134, 37.629867, 37.62324, 37.622424);    // x-coordinates of the vertices of the polygon$vertices_y = array(-77.458334,-77.449021,-77.445416,-77.457819); // y-coordinates of the vertices of the polygon$points_polygon = count($vertices_x) - 1;  // number vertices - zero-based array$longitude_x = $_GET["longitude"];  // x-coordinate of the point to test$latitude_y = $_GET["latitude"];    // y-coordinate of the point to testif (is_in_polygon($points_polygon, $vertices_x, $vertices_y, $longitude_x, $latitude_y)){  echo "Is in polygon!";}else echo "Is not in polygon";function is_in_polygon($points_polygon, $vertices_x, $vertices_y, $longitude_x, $latitude_y){  $i = $j = $c = 0;  for ($i = 0, $j = $points_polygon ; $i < $points_polygon; $j = $i++) {    if ( (($vertices_y[$i]  >  $latitude_y != ($vertices_y[$j] > $latitude_y)) &&     ($longitude_x < ($vertices_x[$j] - $vertices_x[$i]) * ($latitude_y - $vertices_y[$i]) / ($vertices_y[$j] - $vertices_y[$i]) + $vertices_x[$i]) ) )       $c = !$c;  }  return $c;}

附加：
有关更多功能，我建议您使用此处提供的polygon.php类。使用顶点创建类，并

isInside