从数据库读取某经纬度附近1km的地点
2019-11-15 22:05:56

```$slat = $banner_content['jd'];$slng = $banner_content['wd'];$sql = "select *, acos(sin(($slng*3.1415)/180) * sin((wd*3.1415)/180) + cos(($slng*3.1415)/180) * cos((wd*3.1415)/180) * cos(($slat*3.1415)/180 - (jd*3.1415)/180))*6370.996 AS juli FROM {$this->model->pre}post where ......

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