Node has one child, but I can't acces its name, content or grandchild [duplicate]

Question

I am very new to simpleXML and parsing in general, I am trying to parse a GPX file which is generated by tracking devises. Here is the first node as an exemple, I have been able to retrieve lat, lon ele and time but I can't manage to access the different extensions.

Here is the code I am using to access this part :

foreach ($fichier_gpx->trk->trkseg as $tracksegment){
    echo "Nouveau segment <br>";
    foreach($tracksegment->trkpt as $trackpoint){
        $point = new PointsGPX($trackpoint->time,$trackpoint->attributes()->lat,$trackpoint->attributes()->lon,$trackpoint->ele); //besoin de mettre attributes() pour récupérer lon et lat

        $tab_points->append($point);
        if(isset($trackpoint->extensions)){
            echo "I get here <br>";
            echo("There are ".$trackpoint->extensions->count()." children<br>");
            var_dump($trackpoint->extensions);
            $extensions_child = $trackpoint->extensions->children();
            echo $extensions_child->getName()." contains <br>";
            var_dump($extensions_child);
            echo("<br><br>");
        }
    }
}

And what it gives me :

However ! I can somehow get the values but not there node's name using this code :

foreach ($fichier_gpx->trk->trkseg as $tracksegment){
    foreach($tracksegment->trkpt as $trackpoint){
        $point = new PointsGPX($trackpoint->time,$trackpoint->attributes()->lat,$trackpoint->attributes()->lon,$trackpoint->ele); //besoin de mettre attributes() pour récupérer lon et lat

        $tab_points->append($point);
        if(isset($trackpoint->extensions)){
            echo "Point has extensions :<br>";
            echo "values : ".$trackpoint->extensions->asXML()."<br><br>";
            // foreach($trackpoint->extension->children() as $enfant){
            // }
        }
    }
}

Thank you infinitely for your help !

Answer 1

You're displaying the XML on a web page, so the web browser is treating the XML tags as unknown HTML tags and ignoring them. Use htmlentities() to encode them so you'll see the tags.

echo "values : ".htmlentities($trackpoint->extensions->asXML())."<br><br>";