Developer's Guide - MapGuide Open Source - OSGeo

(initialization etc. not shown here)
// Open the map
$map = new MgMap();
$map->Open($resourceService, 'Sheboygan');
// --------------------------------------------------//
// Load a layer from XML, and use the DOM to change it
// Load the prototype layer definition into
// a PHP DOM object.
$domDocument =
DOMDocument::load('RecentlyBuilt.LayerDefinition');
if ($domDocument == NULL)
{
echo "The layer definition
'RecentlyBuilt.LayerDefinition' could not be
found.\n";
return;
}
// Change the filter
$xpath = new DOMXPath($domDocument);
$query = '//AreaRule/Filter';
// Get a list of all the elements in
// the XML.
$nodes = $xpath->query($query);
// Find the correct node and change it
foreach ($nodes as $node )
{
if ($node->nodeValue == 'YRBUILT > 1950')
{
$node->nodeValue = 'YRBUILT > 1980';
}
}
// Change the legend label
$query = '//LegendLabel';
// Get a list of all the elements in the
// XML.
$nodes = $xpath->query($query);
// Find the correct node and change it
foreach ($nodes as $node )
{
if ($node->nodeValue == 'Built after 1950')
{
$node->nodeValue = 'Built after 1980';
}
58 | Chapter 4 Modifying Maps and Layers