我想显示给定lat和long附近的所有点

Question

$ulat = $data['ULat'];
$ulong = $data['ULong'];

$sql = "SELECT PostId, (3959 * acos(cos(radians($ulat)) 
*cos(radians(LocationLat))* cos(radians(LocationLong) - radians($ulong)) + s 
in(radians($ulat))* sin(radians(LocationLat)))) AS distance FROM 
VehicleDetails HAVING distance < 2500 ORDER BY distance LIMIT 0, 20";


  $query = mysqli_query($con, $sql) or die('query fails');
  var_dump($query);

我只获得一行数据，即使距离为0.当我手动输入LocationLong和LocationLat的值时，它返回正确的距离，但是当变量如上所述通过时返回0。

我的输出：array（4）{   [0] =＆GT;   字符串（1）＆＃34; 1＆＃34;   [＆＃34;＆帖子ID＃34;] =＆GT;   字符串（1）＆＃34; 1＆＃34;   [1] =＆GT;   string（1）＆＃34; 0＆＃34;   [＆＃34;距离＆＃34;] =＆GT;   string（1）＆＃34; 0＆＃34; }