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//获取经纬度 默认值为0.5千米

function returnSquarePoint($lng, $lat, $distance = 0.5)

{

define('EARTH_RADIUS', '6371'); //地球半径，平均半径为6371km

$dlng = 2 * asin(sin($distance / (2 * EARTH_RADIUS)) / cos(deg2rad($lat)));

$dlng = rad2deg($dlng);

$dlat = $distance / EARTH_RADIUS;

$dlat = rad2deg($dlat);

return array(

'left-top' => array('lat' => $lat + $dlat, 'lng' => $lng - $dlng),

'right-top' => array('lat' => $lat + $dlat, 'lng' => $lng + $dlng),

'left-bottom' => array('lat' => $lat - $dlat, 'lng' => $lng - $dlng),

'right-bottom' => array('lat' => $lat - $dlat, 'lng' => $lng + $dlng),

);

}

/**

* 计算两点地理坐标之间的距离

* @param Decimal $longitude1 起点经度

* @param Decimal $latitude1 起点纬度

* @param Decimal $longitude2 终点经度

* @param Decimal $latitude2 终点纬度

* @param Int $unit 单位 1:米 2:公里

* @param Int $decimal 精度 保留小数位数

* @return Decimal

*/

function getDistance($longitude1, $latitude1, $longitude2, $latitude2, $unit=2, $decimal=2){

$EARTH_RADIUS = 6370.996; // 地球半径系数

$PI = 3.1415926;

$radLat1 = $latitude1 * $PI / 180.0;

$radLat2 = $latitude2 * $PI / 180.0;

$radLng1 = $longitude1 * $PI / 180.0;

$radLng2 = $longitude2 * $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 = $distance / 1000;

}

return round($distance, $decimal);

}

//$lng = 117.072157 $lat= 36.187136

$squares = returnSquarePoint($lng, $lat);

$where = "lat<>0 and lat >= {$squares['right-bottom']['lat']} and lat<={$squares['left-top']['lat']} and lng>={$squares['left-top']['lng']} and

lng<={$squares['right-bottom']['lng']} and user_status !=0 and is_auth=1 and id !=".$uid;

$field = "*";

$order = "SQRT((".$lng ."- lng)*(".$lng ."- lng)+(".$lat."- lat )*(".$lat."- lat))";

$list = db('user')->where($where)->order($order)->page($page)->select();

$list = emcee_complete($list);

foreach ($list as &$v) {

//计算距离

$v['distance']=getDistance($lng, $lat, $v['lng'], $v['lat'], $unit=2, $decimal=2);

}