update

app/Http/Controllers/Mobile/OtherController.php

@@ -140,20 +140,20 @@ class OtherController extends CommonController
         $sortName = $all['sort_name'] ?? 'distance';
         $sortType = $all['sort_type'] ?? 'asc';
 
-        // 使用简单的距离计算公式
+        // 使用简化的距离计算公式，避免精度问题
         $distanceFormula = "
-            (6371 * acos(
-                cos(radians(?)) * 
-                cos(radians(CAST(company_latitude AS DECIMAL(10,8)))) * 
-                cos(radians(CAST(company_longitude AS DECIMAL(10,8))) - radians(?)) + 
-                sin(radians(?)) * 
-                sin(radians(CAST(company_latitude AS DECIMAL(10,8))))
+            (6371 * 2 * asin(
+                sqrt(
+                    pow(sin(radians((CAST(company_latitude AS DECIMAL(10,8)) - ?) / 2)), 2) +
+                    cos(radians(?)) * cos(radians(CAST(company_latitude AS DECIMAL(10,8)))) *
+                    pow(sin(radians((CAST(company_longitude AS DECIMAL(10,8)) - ?) / 2)), 2)
+                )
             )) AS distance
         ";
 
         // 先构建基础查询
         $query = Company::select('*')
-            ->selectRaw($distanceFormula, [$latitude, $longitude, $latitude])
+            ->selectRaw($distanceFormula, [$latitude, $latitude, $longitude])
             ->where(function ($query) use ($all) {
                 if (isset($all['company_name'])) {
                     $query->where('company_name', 'like', '%' . $all['company_name'] . '%');
@@ -213,7 +213,7 @@ class OtherController extends CommonController
             'expected_distance' => 13.22,
             'actual_distance' => $result->first() ? $result->first()->distance : 'N/A',
             'formula' => $distanceFormula,
-            'parameters' => [$latitude, $longitude, $latitude]
+            'parameters' => [$latitude, $latitude, $longitude]
         ]);
 
         return $this->success($result);