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80 lines
2.8 KiB
80 lines
2.8 KiB
<?php
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/**
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* 尋找最近的作番地點
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* @url /app-browser_gpslocation-find.php
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* @method POST
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* @return JSON
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*
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* request
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* {
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* "lat" 緯度
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* "lng" 經度
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* }
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*
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* respons json
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* {
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* "st" : "ok",
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* "err" : ""
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* }
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**/
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$data = [];
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$rarr = array('st' => 'ok', 'err' => '');
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try {
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error_log("api start 1\n",3,"gps.log");
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error_log("POST=".print_r($_POST,1)."\n",3,"gps.log");
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if (empty($_POST) || empty($_POST["lat"]) || empty($_POST["lng"])) throw new \Exception("parameter empty");
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foreach ($_POST as $k => $v) {
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$$k = htmlspecialchars(stripslashes(trim($v)));
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}
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error_log("api start 2\n",3,"gps.log");
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require_once "db/database.php";
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/* Method.1
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define("EARTH_RADIUS", 6371); //地球半徑，平均半徑為6371km
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/**
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* 計算某個經緯度的周圍某段距離的正方形的四個點
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* @param lng float 經度
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* @param lat float 緯度
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* @param distance float 該點所在圓的半徑，該圓與此正方形內切，默認值為1公里
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* @return array 正方形的四個點的經緯度坐標
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*/
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/*
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function returnSquarePoint($lng, $lat, $distance = 5) {
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$dlng = 2*asin(sin($distance/(2*EARTH_RADIUS))/cos(deg2rad($lat)));
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$dlng = rad2deg($dlng);
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$dlat = $distance/EARTH_RADIUS;
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$dlat = rad2deg($dlat);
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return array("left-top" => array("lat" => $lat+$dlat, "lng" => $lng-$dlng),
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"right-top" => array("lat" => $lat+$dlat, "lng" => $lng+$dlng),
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"left-bottom" => array("lat" => $lat-$dlat, "lng" => $lng-$dlng),
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"right-bottom" => array("lat" => $lat-$dlat, "lng" => $lng+$dlng));
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}
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$squares = returnSquarePoint($lng, $lat);
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$sql = "select address from facility ";
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$sql .= "where latitude > '".$squares["right-bottom"]["lat"]."' and latitude < '".$squares["left-top"]["lat"]."'";
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$sql .= "and longitude > '".$squares["left-top"]["lng"]."' and longitude < '".$squares["right-bottom"]["lng"]."' ";
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$sql .= "group by address";
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*/
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/* Method.2 */
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//$latitude = substr($lat, 0, strpos($lat, ".")).substr($lat, strpos($lat, "."), 4);
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$latitude = substr($lat, 0, 6);
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//$longitude = substr($lng, 0, strpos($lng, ".")).substr($lng, strpos($lng, "."), 4);
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$longitude = substr($lng, 0, 7);
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$sql = "select address from facility where latitude like '".$latitude."%' and longitude like '".$longitude."%'";
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error_log($sql."\n",3,"gps.log");
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$res = mysqli_query($link, $sql);
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while ($row = mysqli_fetch_row($res)) {
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$data[] = $row[0];
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}
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mysqli_free_result($res);
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error_log("data=".print_r($data,1)."\n",3,"gps.log");
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$rarr['content'] = $data;
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}catch(\Exception $e) {
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$rarr['st'] = 'err';
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$rarr['err'] = $e->getMessage();
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}
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echo json_encode($rarr, JSON_UNESCAPED_UNICODE);
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?>
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