如何在使用php DOMDocument的KML文件中获得特定的标签 - How to get specific tag in KML file using php DOMDocument?

How to get specific tag in KML file using php DOMDocument?

本文关键字：标签文件 KML php DOMDocument | 更新日期: 2023-09-27

我有一个。kml文件，形状像这样:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<Document>
    <name>myFile.shp</name>
    <Style id="style1">
        <PolyStyle>
            <color>ff00ff00</color>
        </PolyStyle>
    </Style>
    <Folder id="layer 0">
        <name>background</name>
        <Placemark>
            <styleUrl>#style1</styleUrl>
            <LineString>
                <coordinates>
                    -2.94040373,54.83409343483 -2.943834733,54.893839393
                </coordinates>
            </LineString>
        </Placemark>
      </Folder>
</Document>
</kml>

如何将此文件作为DOMDocument，并获得ALL标记元素，名称为"coordinates" ?

目标是能够获得坐标，即使文件形状改变，例如:

<kml xmlns="http://earth.google.com/kml/2.0">
  <Folder>
    <name>OpenLayers export</name>
    <description>No description available</description>
    <Placemark>
      <name>OpenLayers.Feature.Vector_7341</name>
      <description>No description available</description>
      <Polygon>
        <outerBoundaryIs>
          <LinearRing>
            <coordinates>
              -2.94040373,54.83409343483 -2.943834733,54.893839393
            </coordinates>
          </LinearRing>
        </outerBoundaryIs>
      </Polygon>
    </Placemark>
  </Folder>
</kml>

我的尝试是使用simplexml_load_file()循环遍历文档，但不幸的是，我不会可靠的"标签顺序"之间的这两个文档之间的变化，我不知道为什么它不遵循一个单一的模式(这导致我问这个问题，因为它可能有超过2个形状的KML ?如果我说错了请指正)。

使用DOMDocument类解析XML。然后用getElementsByTagName()得到所有coordinates元素。

$dom = new DOMDocument();
// load file 
$dom->load("file.kml");
// get coordinates tag
$coordinates = $dom->getElementsByTagName("coordinates");
foreach($coordinates as $coordinate){
    echo $coordinate->nodeValue;
}