/*     * 地图上半径内的经纬度     * @param lat 纬度 lon 经度 raidus 单位米     */    function getAround($lat,$lon,$raidus){        $raidus = empty($raidus)?3000:$raidus;        $PI = 3.14159265;        $latitude = $lat;        $longitude = $lon;        $degree = (24901*1609)/360.0;        $raidusMile = $raidus;        $dpmLat = 1/$degree;        $radiusLat = $dpmLat*$raidusMile;        $minLat = $latitude-$radiusLat;        $maxLat = $latitude + $radiusLat;        $mpdLng = $degree*cos($latitude * ($PI/180));        $dpmLng = 1 / $mpdLng;        $radiusLng = $dpmLng*$raidusMile;        $minLng = $longitude - $radiusLng;        $maxLng = $longitude + $radiusLng;        $data[‘minLat‘] = $minLat;        $data[‘maxLat‘] = $maxLat;        $data[‘minLng‘] = $minLng;        $data[‘maxLng‘] = $maxLng;        return $data;    }