Re: Parsing GPX with SimpleXML

["Stefan A." <acid24@xxxxxxxxx>]

And whole code I've used to test 

<?php

$xml = <<<XML
<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>
XML;

$gpx = simplexml_load_string($xml, SimpleXMLElement::class, LIBXML_NOBLANKS);

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;
            echo "    extensions: c: ", $pt->extensions->{'geotracker:meta'}['c'] ?? 'N/A', " s: ", $pt->extensions->{'geotracker:meta'}['s'] ?? 'N/A', "\n";
        }
    }
}

Maybe you need the LIBXML_NOBLANKS option

On Wed, Dec 18, 2019 at 4:41 PM Stefan A. <acid24@xxxxxxxxx> wrote:

This is the output of the command php -i | grep xml

$ php -i | grep xml
Configure Command =>  './configure'  '--prefix=/usr/local/Cellar/php@7.2/7.2.23' '--localstatedir=/usr/local/var' '--sysconfdir=/usr/local/etc/php/7.2' '--with-config-file-path=/usr/local/etc/php/7.2' '--with-config-file-scan-dir=/usr/local/etc/php/7.2/conf.d' '--with-pear=/usr/local/Cellar/php@7.2/7.2.23/share/php@7.2/pear' '--enable-bcmath' '--enable-calendar' '--enable-dba' '--enable-dtrace' '--enable-exif' '--enable-ftp' '--enable-fpm' '--enable-intl' '--enable-mbregex' '--enable-mbstring' '--enable-mysqlnd' '--enable-opcache-file' '--enable-pcntl' '--enable-phpdbg' '--enable-phpdbg-webhelper' '--enable-shmop' '--enable-soap' '--enable-sockets' '--enable-sysvmsg' '--enable-sysvsem' '--enable-sysvshm' '--enable-wddx' '--enable-zip' '--with-apxs2=/usr/local/opt/httpd/bin/apxs' '--with-bz2=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-curl=/usr/local/opt/curl-openssl' '--with-fpm-user=_www' '--with-fpm-group=_www' '--with-freetype-dir=/usr/local/opt/freetype' '--with-gd' '--with-gettext=/usr/local/opt/gettext' '--with-gmp=/usr/local/opt/gmp' '--with-iconv=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-icu-dir=/usr/local/opt/icu4c' '--with-jpeg-dir=/usr/local/opt/jpeg' '--with-kerberos=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-layout=GNU' '--with-ldap=/usr/local/opt/openldap' '--with-ldap-sasl=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-libxml-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-libedit=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-libzip' '--with-mhash=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-mysql-sock=/tmp/mysql.sock' '--with-mysqli=mysqlnd' '--with-ndbm=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-openssl=/usr/local/opt/openssl@1.1' '--with-password-argon2=/usr/local/opt/argon2' '--with-pdo-dblib=/usr/local/opt/freetds' '--with-pdo-mysql=mysqlnd' '--with-pdo-odbc=unixODBC,/usr/local/opt/unixodbc' '--with-pdo-pgsql=/usr/local/opt/libpq' '--with-pdo-sqlite=/usr/local/opt/sqlite' '--with-pgsql=/usr/local/opt/libpq' '--with-pic' '--with-png-dir=/usr/local/opt/libpng' '--with-pspell=/usr/local/opt/aspell' '--with-sodium=/usr/local/opt/libsodium' '--with-sqlite3=/usr/local/opt/sqlite' '--with-tidy=/usr/local/opt/tidy-html5' '--with-unixODBC=/usr/local/opt/unixodbc' '--with-webp-dir=/usr/local/opt/webp' '--with-xmlrpc' '--with-xsl=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr' '--with-zlib=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr'
xmlrpc_error_number => 0 => 0
xmlrpc_errors => Off => Off
libxml Version => 2.9.4
libxml
mbstring.http_output_conv_mimetypes => ^(text/|application/xhtml\+xml) => ^(text/|application/xhtml\+xml)
Simplexml support => enabled
xml
libxml2 Version => 2.9.4
xmlreader
xmlrpc
core library version => xmlrpc-epi v. 0.51
homepage => http://xmlrpc-epi.sourceforge.net
xmlwriter
libxslt compiled against libxml Version => 2.9.4

On Wed, Dec 18, 2019 at 3:08 PM Ashley M. Kirchner <kirash4@xxxxxxxxx> wrote:

Yeah I tried that. Didn't work. May I ask what XML extension you're using?

On Wed, Dec 18, 2019 at 5:07 AM Stefan A. <acid24@xxxxxxxxx> wrote:

This worked for me on PHP 7.2

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;
            echo "    extensions: c: ", $pt->extensions->{'geotracker:meta'}['c'] ?? 'N/A', " s: ", $pt->extensions->{'geotracker:meta'}['s'] ?? 'N/A', "\n";
        }
    }
}

On Wed, Dec 18, 2019 at 1:04 PM Aziz Saleh <azizsaleh@xxxxxxxxx> wrote:

On Tue, Dec 17, 2019 at 10:56 PM Ashley M. Kirchner <kirash4@xxxxxxxxx> wrote:

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

Converting it to array should make it easier for you:

https://www.php.net/manual/en/function.xml-parse-into-struct.php