PHP循环通过GPX计算轨迹的总距离
我想通过一个gpx文件循环并计算总距离。我有一个函数，可以计算两组lat long点之间的距离，我已经设置了simplexml来读取并循环通过gpx文件trkseg点 我真的很难（仍在学习）将其带到下一阶段，即获取两组lat long值，将其添加到总距离var，然后循环到下一组值。有人能告诉我PHP的正确方向吗PHP循环通过GPX计算轨迹的总距离,php,xml,loops,gpx,Php,Xml,Loops,Gpx,我想通过一个gpx文件循环并计算总距离。我有一个函数，可以计算两组lat long点之间的距离，我已经设置了simplexml来读取并循环通过gpx文件trkseg点 我真的很难（仍在学习）将其带到下一阶段，即获取两组lat long值，将其添加到总距离var，然后循环到下一组值。有人能告诉我PHP的正确方向吗 <?php // Funcntion for calculating distance between to sets of lat/long points function d
<?php
// Funcntion for calculating distance between to sets of lat/long points
function distance($lat1, $lon1, $lat2, $lon2, $unit) {
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$miles = $dist * 60 * 1.1515;
$unit = strtoupper($unit);
if ($unit == "K") {
return ($miles * 1.609344);
} else if ($unit == "N") {
return ($miles * 0.8684);
} else {
return $miles;
}
}
// Read GPX file, find track lat/lon attributes and loop
$xml=simplexml_load_file("mygpxfile.gpx");
echo $xml->trk->name;
echo "<br>";
foreach( $xml->trk->trkseg->{'trkpt'} as $trkpt ) {
$trkptlat = $trkpt->attributes()->lat;
$trkptlon = $trkpt->attributes()->lon;
}
// How do I use the function above to now loop through all the values to calc total distance?
// $total_distance = distance($lat1, $lon1, $lat2, $lon2, $unit)
?>
trk->name；
回声“
”；
foreach（$xml->trk->trkseg->{'trkpt'}作为$trkpt）{
$trkptlat=$trkpt->attributes（）->lat；
$trkptlon=$trkpt->attributes（）->lon；
}
//现在如何使用上面的函数循环所有值以计算总距离？
//$total_distance=距离（$lat1，$lon1，$lat2，$lon2，$unit）
?>
<?
$last_lat = false;
$last_lon = false;
$total_distance = 0;
foreach( $xml->trk->trkseg->{'trkpt'} as $trkpt ) {
$trkptlat = $trkpt->attributes()->lat;
$trkptlon = $trkpt->attributes()->lon;
if($last_lat){
$total_distance+=distance($trkptlat, $trkptlon, $last_lat, $last_lon, 'k');
}
$last_lat = $trkptlat;
$last_lon = $trkptlon;
}
echo $total_distance;
?>
trk->trkseg->{'trkpt'}作为$trkpt）{
$trkptlat=$trkpt->attributes（）->lat；
$trkptlon=$trkpt->attributes（）->lon；
如果（$last_lat）{
$total_distance+=距离（$trkptlat，$trkptlon，$last_lat，$last_lon，'k'）；
}
$last_lat=$trkptlat；
$last_lon=$trkptlon；
}
echo$总距离；
?>