php验证地图坐标在某片坐标区域内

mysql空间查询并不太适合地图坐标，如果使用：http://www.cnblogs.com/tyjsjl/p/8760002.html的方式进行地图点坐标的查询就不好用了，于是直接使用php来进行地图范围的查询更方便点。代码如下：

 /**
  * 验证坐标点是否在某区域内
  * @author xiaoliang <[e-mail]>
  * Class validationMap
  */
 class validationMap{
     private $coordArray;
     private $vertx = [];
     private $verty = [];
     /**
      * 设置坐标区域
      * @param mixed $coordArray
      */
     public function setCoordArray(array $coordArray)
     {
         $this->coordArray = $coordArray;
     }
     /**
      * 验证区域范围
      * @param array $coordArray
      * @return bool
      */
     public function isCityCenter(array $coordArray){
         if(!$this->vaildatePoint($coordArray)){
             return false;
         }
         return $this->pnpoly(count($this->coordArray), $coordArray['lng'], $coordArray['lat']);
     }
     /**
      * 比较区域坐标
      * @param $nvert
      * @param $testx
      * @param $testy
      * @return bool
      */
     private function pnpoly($nvert,$testx, $testy)
     {
         $c = false;
         for ($i = 0, $j = $nvert-1; $i < $nvert; $j = $i++) {
             if ( ( ($this->verty[$i]>$testy) != ($this->verty[$j]>$testy) ) && ($testx < ($this->vertx[$j]-$this->vertx[$i]) * ($testy-$this->verty[$i]) / ($this->verty[$j]-$this->verty[$i]) + $this->vertx[$i]) )
                 $c = !$c;
         }
         return $c;
     }
     /**
      * 验证坐标
      * @param array $pointArray
      * @return bool
      */
     private function vaildatePoint(array $pointArray){
         $maxY = $maxX = 0;
         $minY = $minX = 9999;
         foreach ($this->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'];
             $this->vertx[] = $item['lng'];
             $this->verty[] = $item['lat'];
         }
         if ($pointArray['lng'] < $minX || $pointArray['lng'] > $maxX || $pointArray['lat'] < $minY || $pointArray['lat'] > $maxY) {
             return false;
         }
         return true;
     }
 }

/**************************** test *************************************
$map = [  //上海
    ["lng" => 121.488286, "lat" => 31.420147],
    ["lng" => 121.702154, "lat" => 31.294828],
    ["lng" => 121.780918, "lat" => 31.141157],
    ["lng" => 121.782068, "lat" => 30.941157],
    ["lng" => 121.492885, "lat" => 30.909931],
    ["lng" => 121.22325, "lat" => 30.890099],
    ["lng" => 121.161482, "lat" => 31.015526],
    ["lng" => 121.076395, "lat" => 31.226239],
    ["lng" => 121.189873, "lat" => 31.339688],
    ["lng" => 121.459509, "lat" => 31.41368],
];
$array = ["lat"=>31.218681,"lng"=>121.08604];//进行验证的区域
validationMap::setCoordArray($map);
var_dump(validationMap::isCityCenter($array));

因为每个区域的地图点坐标需要从数据库提取进行查询，所以静态类就不太方便了，本文代码不使用静态类。关于静态类的优缺点在此不作说明。

原文代码：https://www.cnblogs.com/liang94/p/5936583.html