Parsing GPX with SimpleXML

["Ashley M. Kirchner" <kirash4@xxxxxxxxx>]

Hi folks,

I'm having a hard time figuring this one out. I have the following (snippet) of a GPX file:

<gpx version="1.1" ...>

  <trk>

    <trkseg>
      <trkpt lat="39.998454" lon="-105.086447">
        <ele>1568</ele>
        <time>2019-12-16T10:59:47.000Z</time>
        <extensions>
          <geotracker:meta s="0" />
        </extensions>
      </trkpt>
      <trkpt lat="39.998553" lon="-105.086417">
        <ele>1577</ele>
        <time>2019-12-16T11:01:39.000Z</time>
        <extensions>
          <geotracker:meta c="0.03" s="1.83" />
        </extensions>
      </trkpt>

      ...

      ...

    </trkseg>

  </trk>

</gpx>

Getting to the most of the nodes is easy:

<?php
//open gpx file
$gpx = simplexml_load_file("Dec_16,_2019_3_59_47_AM.gpx");

foreach ($gpx->trk as $trk) {
    foreach ($trk->trkseg as $seg) {
        foreach ($seg->trkpt as $pt) {
            echo "lat: ", $pt["lat"], "   lon: ", $pt["lon"];
            echo "    ele: ", $pt->ele, "   time: ", $pt->time, "\n";
        }
    }
}
unset($gpx);

?>

But for the life of me, I can't figure out how to get information that's on the geotracker:meta line. Also note that not every single one of them will have both the 'c' and 's' attributes. Does anyone have any pointers pls?

A