xml DOM : delete element with condition - php

Question

May be the question is already answered in a way or in another in many questions, but since I'm a new bie in XML, I can't figured it out in my project.
I have an RSS (XML) file with this structure:
<rss>
<channel>
<item>
<title>some title</title>
<description> some descrp </description>
...
</item>
</channel>
</rss>
How can I, in PHP, delete some item when the title is equal to some value? THanks.
EDIT1 : I have my XML file stored at my web server.

Answer 1

$rss = "
<rss>
<channel>
<item>
<title>some title</title>
<description> some descrp </description>
</item>
<item>
<title>some other title</title>
<description> some descrp </description>
</item>
</channel>
</rss>
";
$doc = new DOMDocument();
$doc->loadXML($rss);
$xpath = new DOMXPath($doc);
$els = $xpath->query('//title[text()="some title"]');
foreach($els as $el)
{
$parent = $el->parentNode;
$parent->parentNode->removeChild($parent);
}
echo $doc->saveXML();
It searches for exact match.
ps: another method, without xpath
$doc = new DOMDocument();
$doc->loadXML($rss);
$els = $doc->getElementsByTagName('title');
for($i = $els->length-1; $i >= 0; $i--)
{
$el = $els->item($i);
if ($el->nodeValue == 'some title')
{
$parent = $el->parentNode;
$parent->parentNode->removeChild($parent);
}
}
echo $doc->saveXML();