I am trying to append a child element to XML node
$rel->appendChild($domtree->createElement('title',NULL));
I want it to output like this
<title></title>
But I got this instead
<title/>
How to create this with an empty value ?
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The person who ask the question did the same thing you want to do: http://stackoverflow.com/questions/4516657/how-do-i-create-an-empty-blank-simplexmlelement-in-phpSteven– Steven2013-03-19 15:31:00 +00:00Commented Mar 19, 2013 at 15:31
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so what, i got the answer...Utku Dalmaz– Utku Dalmaz2013-03-19 15:40:02 +00:00Commented Mar 19, 2013 at 15:40
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2 Answers
You need to explicitly add an empty text node:
$title = $domtree->createElement('title');
$title->appendChild($domtree->createTextNode(''));
$rel->appendChild($title);
The second argument to createElement() is non-standard and I personally don't use it, because it can produce slightly unintuitive behaviour like this.
You should always create text nodes explicitly in my opinion. Another reason for doing this is that text nodes automatically handle escaping correctly, unlike the non-standard second argument which requires that you manually escape the text data.
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For future reference, here's how you can easily build your xml from array (including empty elements):
class Test {
public function getTestXml()
{
$testElements = [
'foo' => 'foo',
'bar' => 'bar',
'baz' => [
'empty' => null,
],
];
$xml = new \DOMDocument('1.0', 'UTF-8');
$test = $this->buildXmlNodeFromArray($xml, 'test', $testElements);
$xml->appendChild($test);
return $xml->saveXml();
}
/* Here's where all the magic happens */
private function buildXmlNodeFromArray(\DOMDocument $document, $nodeName, array $nodeElements)
{
$node = $document->createElement($nodeName);
foreach ($nodeElements as $key => $value) {
if (null === $value || '' === $value) {
$emptyValue = $document->createTextNode('');
$emptyElement = $document->createElement($key);
$emptyElement->appendChild($emptyValue);
$node->appendChild($emptyElement);
} elseif (is_array($value)) {
$subNode = $this->buildXmlNodeFromArray($document, $key, $value);
$node->appendChild($subNode);
} else {
$node->appendChild($document->createElement($key, $value));
}
}
return $node;
}
}
$test = new Test();
echo $test->getTestXml();
Result:
<?xml version="1.0" encoding="UTF-8"?>
<test>
<foo>foo</foo>
<bar>bar</bar>
<baz>
<empty></empty>
</baz>
</test>
