- PHP’s SimpleXML extension was introduced back in PHP 5.0
- An increasing number of web services return data in JSON format, but a large number still return XML
- The code below demonstrates both reading of : XML Elements and XML Attributes
- The entire DOM tree is read into memory and returns a
SimpleXMLElementPHP object - Use this APi with caution for large XML files
Table of Contents
XML data
<trk> <name>Neue Positionsliste 1</name> <trkseg> <trkpt lat="49.81208" lon="11.353953"> <ele>379.0</ele> <time>2015-12-07T12:47:05.000Z</time> <name>Position 1</name> <extensions> <nmea:speed>2.45</nmea:speed> </extensions> </trkpt> <trkpt lat="49.812103" lon="11.353962"> <ele>379.0</ele> <time>2015-12-07T12:47:06.000Z</time> <name>Position 2</name> <extensions> <nmea:speed>2.75</nmea:speed> </extensions> </trkpt> ...
PHP code
function parseGPX($dirName, $fileName)
{
global $gpxArray;
global $gpxCount;
$gpxArray = simplexml_load_file($dirName.$fileName);
$gpxCount = count($gpxArray->trk->trkseg->trkpt);
$i = 0;
print_r($gpxArray->trk->trkseg->trkpt[0]);
print_r("First GPX Element:: Lat: ".$gpxArray->trk->trkseg->trkpt[0]["lat"]." - Lon: ".$gpxArray->trk->trkseg->trkpt[0]["lon"].
" - Ele: ".$gpxArray->trk->trkseg->trkpt[0]->ele."\n");
printf("\n");
foreach ($gpxArray->trk->trkseg->trkpt as $gpxElem)
{
$i++;
if ( $i == 1 || $i == $gpxCount || ( $i % 100) === 0 )
printf("\n% -4d: Lat: % -10s - Lon:% -10s - Ele: % -6s", $i, $gpxElem["lat"], $gpxElem["lon"], $gpxElem->ele );
}
printf("\n");
print_r("GPX Array Count: ".count($gpxArray->trk->trkseg->trkpt)."\n");
error_log('gpxCount: '.$gpxCount);
}
PHP Output
( [@attributes] => Array ( [lat] => 49.81208 [lon] => 11.353953 ) [ele] => 379.0 [time] => 2015-12-07T12:47:05.000Z [name] => Position 1 [extensions] => SimpleXMLElement Object ( ) ) Output: First GPX Element:: Lat: 49.81208 - Lon: 11.353953 - Ele: 379.0 1 : Lat: 49.81208 - Lon:11.353953 - Ele: 379.0 100 : Lat: 49.81406 - Lon:11.353427 - Ele: 393.0 200 : Lat: 49.814999 - Lon:11.35364 - Ele: 405.0 300 : Lat: 49.815887 - Lon:11.354074 - Ele: 420.0 400 : Lat: 49.816792 - Lon:11.35475 - Ele: 409.0 500 : Lat: 49.817665 - Lon:11.355126 - Ele: 407.0 600 : Lat: 49.818573 - Lon:11.354907 - Ele: 414.0 700 : Lat: 49.819462 - Lon:11.35405 - Ele: 417.0 800 : Lat: 49.820202 - Lon:11.353247 - Ele: 417.0 900 : Lat: 49.820946 - Lon:11.35268 - Ele: 427.0 1000: Lat: 49.821693 - Lon:11.352285 - Ele: 438.0 1100: Lat: 49.822273 - Lon:11.353273 - Ele: 441.0 1200: Lat: 49.823071 - Lon:11.353742 - Ele: 448.0 1222: Lat: 49.823299 - Lon:11.353806 - Ele: 448.0 GPX Array Count: 1222
Reference
- Parsing XML With SimpleXML http://www.sitepoint.com/parsing-xml-with-simplexml/