根据经纬度查找附近的人
- $uid=$_POST[uid];
- if($uid>0)
- {
- $re=mysql_query("select `lat`,`long` from pre_common_member where uid='$uid'")or die(mysql_error());
- $row=mysql_fetch_assoc($re);
- if(!empty($row[lat]) and !empty($row[long]))
- {
- $re0=mysql_query("select `username`,`lat`,`long` from pre_common_member where uid!='$uid'");
- while($row0=mysql_fetch_assoc($re0))
- {
- $distance = getDistanceBetweenPointsNew($row['lat'], $row['long'], $row0['lat'], $row0['long']);
- $row0[meter]=$distance[meters];
- $arr[]=$row0;
- }
- $arr=array_sort($arr,'meter');
- $arr = array_slice($arr,0,10);
- $data=json_encode($arr);
- $s=mysql_errno();
- //echo $data;
- echo "{"s":$s,"data":$data}";
- }
- }
-
- // 比较两个地点的距离
- function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2)
- {
- $theta = $longitude1 - $longitude2;
- $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
- $miles = acos($miles);
- $miles = rad2deg($miles);
- $miles = $miles * 60 * 1.1515;
- $feet = $miles * 5280;
- $yards = $feet / 3;
- $kilometers = $miles * 1.609344;
- $meters = $kilometers * 1000;
- return compact('miles', 'feet', 'yards', 'kilometers', 'meters');
- }
- // 二维数组按某个key排序
- function array_sort($arr,$keys,$type='asc')
- {
- $keysvalue = $new_array = array();
- foreach ($arr as $k=>$v){
- $keysvalue[$k] = $v[$keys];
- }
- if($type == 'asc'){
- asort($keysvalue);
- }else{
- arsort($keysvalue);
- }
- reset($keysvalue);
- foreach ($keysvalue as $k=>$v){
- $new_array[$k] = $arr[$k];
- }
- return $new_array;
- }
-
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