定位详情页返回距离

app/Service/v3/Implementations/LocationService.php

@@ -26,6 +26,37 @@ class LocationService implements LocationServiceInterface
     public function getMarketListByLocation($cityIds)
     {
         $res = Area::query()->with('markets')->whereIn('id',$cityIds)->get();
+        foreach ($res as &$v){
+            foreach ($v->markets as &$m)
+            {
+                $m->Distance = $this->getDistance($m->lng,$m->lat,108.370333,22.813527);
+            }
+        }
         return $res;
     }
+
+    function getDistance($lng1, $lat1, $lng2, $lat2, $unit = 2, $decimal = 2)
+    {
+
+        $EARTH_RADIUS = 6370.996; // 地球半径系数
+        $PI           = 3.1415926535898;
+
+        $radLat1 = $lat1 * $PI / 180.0;
+        $radLat2 = $lat2 * $PI / 180.0;
+
+        $radLng1 = $lng1 * $PI / 180.0;
+        $radLng2 = $lng2 * $PI / 180.0;
+
+        $a = $radLat1 - $radLat2;
+        $b = $radLng1 - $radLng2;
+
+        $distance = 2 * asin(sqrt(pow(sin($a / 2), 2) + cos($radLat1) * cos($radLat2) * pow(sin($b / 2), 2)));
+        $distance = $distance * $EARTH_RADIUS * 1000;
+
+        if ($unit === 2) {
+            $distance /= 1000;
+        }
+
+        return round($distance, $decimal);
+    }
 }