XML PHP Delete specific Child if? - php

Question

I have a xml document looking like this:
<?xml version="1.0" encoding="ISO-8859-1"?>
<library>
<invites>
<invite>
<username>0</username>
<userid>0</userid>
</invite>
<invite>
<username>Danielle</username>
<gameid>87808</gameid>
</invite>
<invite>
<username>Petra</username>
<userid>978</userid>
</invite>
</invites>
</library>
Now, I want to delete the <invite> with Danielle but I am not sure how? I am using this right now but this will only delete the first record?
$file = 'my.xml';
$fp = fopen($file, "rb") or die("cannot open file");
$str = fread($fp, filesize($file));
$xml = new DOMDocument("1.0", "ISO-8859-1");
$xml->formatOutput = true;
$xml->preserveWhiteSpace = false;
$xml->loadXML($str) or die("Error");
$root = $xml->documentElement;
$fnode = $root->firstChild;
$ori = $fnode->childNodes->item(0);
$fnode->removeChild($ori);
$xml->save($file);
I want to be able to delete depending on either gameid or userid. How do I go about this?
Thanks in advance :-)

Answer 1

You could use XPath to select all nodes that have a certain userid or gameid: http://www.w3schools.com/xpath/default.asp

Answer 2

Try this:
Using DOM & DOMXPath.
<?php
$dom = new DOMDocument( '1.0' );
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
// load the xml file
$dom->loadXML( '<?xml version="1.0" encoding="ISO-8859-1"?>
<library>
<invites>
<invite>
<username>0</username>
<userid>0</userid>
</invite>
<invite>
<username>Danielle</username>
<gameid>87808</gameid>
</invite>
<invite>
<username>Petra</username>
<userid>978</userid>
</invite>
</invites>
</library>', LIBXML_NOBLANKS );
$xpath = new DOMXPath($dom);
//find all 'invite' nodes with username=Danielle and delete'em.
$node = $xpath->query("//invite[username='Danielle']");
// if found, append the new "value" node
if( $node->length ) {
foreach ($node as $n) {
$n->parentNode->removeChild( $n );
}
}
header('content-type: text/xml');
echo $dom->saveXML();
?>
Hope this helps.