I am trying to add a child note to an XML file using PHP. I have used the same method about 5 times before and each one works as expected, however this method is using a different XML structure on a new file (which I think might be part of the problem).
The method causing me the problem is this:
function addCourseToProject($name, $project){ $projects = self::getRoles(); $theProject = $projects->xpath('project[name = "'.$project.'"]'); echo $theProject->name; $theCourses = $theProject[0]->courses->addchild("course", $name); $projects->asXml("projects.xml"); }
The XML file looks like this:
<projects> <project> <name>Alpha</name> <courses> <course>Beta</course> <course>Charlie</course> </courses> </project> </project>
And getRoles()
looks like this:
function getRoles(){ $roles = simplexml_load_file("projects.xml") or die("ERROR: Unable to read file"); return $roles; }
I’m at a loss here, I have no idea why this is different from the other adding functions (see below).
Should you need it, here is an example of what my other methods look like:
function addModule($courseName, $name, $link){ $xml = self::getXml();#get the xml file $course = $xml->xpath('course[name = "'.$courseName.'"]'); $module = $course[0]->addChild("module"); $module->addChild("name", $name); $module->addChild("link", $link); $xml->asXml("data.xml"); echo self::toJSON($course); }
and the getXML()
method:
function getXml(){ $xml=simplexml_load_file("data.xml") or die("ERROR: Unable to read file"); return $xml; }
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Answer
Turned out that the problem was caused by the fact that <project>
element is nested within the XML document. You can use descendant-or-self
axis (//
for the abbreviated syntax) to get nested element like so :
$theProject = $projects->xpath('//project[name = "'.$project.'"]');
or specify the complete path :
$theProject = $projects->xpath('/projects/project[name = "'.$project.'"]');