/** * 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 . $fourpoint['left-top']['lng'] . and lngdb->createcommand($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 $this->ajaxmessage(-1,'附件用户查询失败'); }
public function gettwodistance($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');    }
以上就介绍了php 计算3公里内所以用户的距离，包括了方面的内容，希望对php教程有兴趣的朋友有所帮助。