php 计算3公里内 用户的距离
2015-10-20 10:15
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[php] view
plaincopy
/**
* 计算3公里范围内的用户
* @param type $lng string 经度
* @param type $lat string 维度
* @param type $keyword
* @return type
*/
public function actionNearUserlist()
{
$lng = $_GET['lng'];
$lat = $_GET['lat'];
$keyword = $_GET['keyword'] ? $_GET['keyword'] : "";
$half = 6371;
$distance = 20; //3公里
$dlng = 2 * asin(sin($distance / (2 * $half)) / cos(deg2rad($lat)));
$dlng = rad2deg($dlng);
$dlat = $distance / $half;
$dlat = rad2deg($dlat);
$fourpoint = 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)
);
$where = "";
if ($keyword) {
$where = "and a.name like '%" . $keyword . "%'";
}
//从数据库中查询此范围内的网点
$sql = "select uid,mobile,lng,lat
from std_student
where lat!=0 and lng!=0 and lat>" . $fourpoint['right-bottom']['lat'] . " and lat<" . $fourpoint['left-top']['lat'] .
" and lng>" . $fourpoint['left-top']['lng'] . " and lng<" . $fourpoint['right-bottom']['lng'] . " {$where}";
$res = Yii::app()->db->createCommand($sql)->queryAll();
//print_r($res);
$o = new StdStudent();
$point1 = array('lat' => $lng,'long' => $lat);
$distanc = array();
foreach ($res as $k => $v) {
$distanc = $o->getTwoDistance($point1['lat'],$point1['long'],$v['lng'],$v['lat']);
$res[$k]['meters'] = $distanc['meters'];
}
//print_r($res);
if ($res) {
$this->ajaxMessage(0,'附近三公里的用户',$res);
} else
$this->ajaxMessage(-1,'附件用户查询失败');
}
[php] view
plaincopy
public function getTwoDistance($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');
}
plaincopy
/**
* 计算3公里范围内的用户
* @param type $lng string 经度
* @param type $lat string 维度
* @param type $keyword
* @return type
*/
public function actionNearUserlist()
{
$lng = $_GET['lng'];
$lat = $_GET['lat'];
$keyword = $_GET['keyword'] ? $_GET['keyword'] : "";
$half = 6371;
$distance = 20; //3公里
$dlng = 2 * asin(sin($distance / (2 * $half)) / cos(deg2rad($lat)));
$dlng = rad2deg($dlng);
$dlat = $distance / $half;
$dlat = rad2deg($dlat);
$fourpoint = 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)
);
$where = "";
if ($keyword) {
$where = "and a.name like '%" . $keyword . "%'";
}
//从数据库中查询此范围内的网点
$sql = "select uid,mobile,lng,lat
from std_student
where lat!=0 and lng!=0 and lat>" . $fourpoint['right-bottom']['lat'] . " and lat<" . $fourpoint['left-top']['lat'] .
" and lng>" . $fourpoint['left-top']['lng'] . " and lng<" . $fourpoint['right-bottom']['lng'] . " {$where}";
$res = Yii::app()->db->createCommand($sql)->queryAll();
//print_r($res);
$o = new StdStudent();
$point1 = array('lat' => $lng,'long' => $lat);
$distanc = array();
foreach ($res as $k => $v) {
$distanc = $o->getTwoDistance($point1['lat'],$point1['long'],$v['lng'],$v['lat']);
$res[$k]['meters'] = $distanc['meters'];
}
//print_r($res);
if ($res) {
$this->ajaxMessage(0,'附近三公里的用户',$res);
} else
$this->ajaxMessage(-1,'附件用户查询失败');
}
[php] view
plaincopy
public function getTwoDistance($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');
}
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