<?php

class pointMap{

 private static $coordArray;

 private static $vertx = [];

 private static $verty = [];

 public static function setArray(array $Array)

 {

  self::$coordArray = $Array;

 }

 public static function isCenter(array $testarray){

  if(!self::vaildatePoint($testarray)){

   return false;

  }

  return self::intra(count(self::$coordArray), $testarray['lng'], $testarray['lat']);

 }

 private static function intra($n,$testx, $testy)

 {

   $c = false;

   for ($i = 0, $j = $n-1; $i < $nvert; $j = $i++) {

   if ( ( (self::$verty[$i]>$testy) != (self::$verty[$j]>$testy) ) && ($testx < (self::$vertx[$j]-self::$vertx[$i]) * ($testy-self::$verty[$i]) / (self::$verty[$j]-self::$verty[$i]) + self::$vertx[$i]) )

    $c = !$c;

  }

  return $c;

 }

 private static function vaildatePoint(array $pointArray){

  $maxY = $maxX = 0;

  $minY = $minX = 9999;

  foreach (self::$coordArray as $item){

   if($item['lng']>$maxX) $maxX = $item['lng'];

   if($item['lng'] < $minX) $minX = $item['lng'];

   if($item['lat']>$maxY) $maxY = $item['lat'];

   if($item['lat'] < $minY) $minY = $item['lat'];

   self::$vertx[] = $item['lng'];

   self::$verty[] = $item['lat'];

  }

  if ($pointArray['lng'] < $minX || $pointArray['lng'] > $maxX || $pointArray['lat'] < $minY || $pointArray['lat'] > $maxY) {

   return false;

  }

  return true;

 }

}

$map = [

 ["lng" => 0.0, "lat" => 0.0],

 ["lng" => 0.0, "lat" => 1.0],

 ["lng" => 0.0, "lat" => 2.0],

 ["lng" => 1.0, "lat" => 2.0],

 ["lng" => 2.0, "lat" => 2.0],

 ["lng" => 2.0, "lat" => 1.0],

 ["lng" => 2.0, "lat" => 0.0],

];

$array = ["lat"=>2.0,"lng"=>6.0];

pointMap::setArray($map);

var_dump(pointMap::isCenter($array));