Method checks if a point is contained in the polygon

pointOnPolygon.php

<?php

/*
|--------------------------------------------------------------------------------
| Point on Polygon - DVILLAGRA
|--------------------------------------------------------------------------------
|
| # Method checks if a point is contained in the polygon
|
| @author   Christopher Villagra - <christopher@dvillagra.com.br>
| @param    $polygon [array]
| @param    $point [array]
| @return   $onPolygon [boolean]
|
*/

public function pointPolygon($polygon, $point){

    $onPolygon = false;
    
    //# Get the coordinates of point
    $pX = floatval($point[0]);
    $pY = floatval($point[1]);

    $totalPoints = count($polygon);
    $j = $totalPoints - 1;

    //# Looping to check
    for ($i = 0; $i < $totalPoints; $i++) {
      
      //# Obtaining coordinates of a polygon edges
      $pIni = $polygon[$i];
      $pEnd = $polygon[$j];

      //# First check by Jordan curve theorem
      if(
        (floatval($pIni['x']) <  $pX) && (floatval($pEnd['x']) >= $pX) ||
        (floatval($pEnd['x']) <  $pX) && (floatval($pIni['x']) >= $pX)
        ){
        
          if(
            floatval($pIni['y']) + ($pX - floatval($pIni['x'])) /
            (floatval($pEnd['x']) - floatval($pIni['x'])) *
            (floatval($pEnd['y']) - floatval($pIni['y'])) <
            $pY
            ){
              
              //# Invert status check
              $onPolygon = !$onPolygon;
              
          }
            
      }

      $j = $i;
      
    }

  //# Return if a point is contained in the polygon
  return $onPolygon;

}