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我想确定坐标是否在多边形内，但是我得到了不在多边形内的额外结果。几乎就像它只检查纬度或经度是否在范围内，但不是同时检查两者。有任何想法吗？？

     public function subcacheClients (){
      $clients = gzfile('tmp/whazzup/cache/clients.txt.gz');
      for($i=1;$i<count($clients);$i++){
           $clients[$i] = explode(':', $clients[$i]);
           //polygon of Canada
           $polylat = array(90,82,77,75,65,64,61,53,49,45,45,42,47,47.33,45,45,43.63,43.5,42.83,41.63,41.85,42.33,42.5,43.58,45.33,48,49,49,48.42,48.18,48.5,48.33,5,54,54.83,59.5,60.32,90);
           $polylon = array(-141,-60,-75,-76,-57.75,-63,63,-54,-51,-51,-53,-67,-67.75,-69.33,-71.5,-75,-76.92,-79.2,-78.93,-82.5,-83.06,-83.03,-82.5,-82.12,-82.5,-88.33,-95.0,-123.33,-123.12,-123.35,-124.83,-128,-133.75,-136,-130,-135,-141,-141);

           $inpolygon = $this->inPolygon($clients[$i][5], $clients[$i][6], $polylat, $polylon);
           if($inpolygon == true && $clients[$i][5]>0 && $clients[$i][6]<0 && $clients[$i][3]=='ATC'){
                echo $clients[$i][0];
                file_put_contents('tmp/whazzup/cache/controllersOnline.txt', implode(':', $clients[$i]), FILE_APPEND);
           }
      }
 }
 public function inPolygon($lat, $lon, $polylat, $polylon) {
      $j = count($polylat)-1;
      $result = false;
      for($i=0;$i<count($polylat);$i++){
           if($polylat[$i]<$lat && $polylat[$j]>=$lat
           || $polylat[$j]<$lat && $polylat[$i]>=$lat){ //if the latitude at the beggining is bigger than and at the end is smaller than or vise versa
                if($polylon[$i]+($lat-$polylat[$i])/($polylat[$j]-$polylat[$i])*($polylon[$j]-$polylon[$i])<$lon){ //
                     $result = true;
                }
           }
           $j=$i;
      }
      return $result;
 }
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