How to delete and edit specific xml node using PHP? - php

Question

I am practicing on XML and PHP. I can not find out how to delete the whole xml node. Here is my XML:
<?xml version="1.0" encoding="UTF-8"?>
<items>
<playlist_name>Channel List</playlist_name>
<category>
<category_id>1</category_id>
<category_title>HD</category_title>
</category>
<channel>
<title>VTC HD1</title>
<stream_url><![CDATA[http://203.162.16.22:80/lives/origin01/vtchd1.isml/vtchd1.m3u8]]></stream_url>
<logo_30x30>vtchd1.jpg</logo_30x30>
<category_id>1</category_id>
</channel>
<channel>
<title>VTC HD2</title>
<stream_url><![CDATA[http://203.162.16.22:80/lives/origin01/vtchd2.isml/vtchd2.m3u8]]></stream_url>
<logo_30x30>vtchd2.jpg</logo_30x30>
<category_id>1</category_id>
</channel>
</items>
And here is the code of two function which I am having problem, delete() and edit()
<?php
function delete_channel()
{
$file = "nStream.xml";
$fp = fopen($file, "rb") or die("cannot open file");
$str = fread($fp, filesize($file));
$xml = new DOMDocument();
$xml->formatOutput = true;
$xml->preserveWhiteSpace = false;
$xml->loadXML($str) or die("Error");
// original
// echo "<xmp>OLD:\n". $xml->saveXML() ."</xmp>";
// get document element
$root = $xml->documentElement;
$fnode = $root->firstChild;
//get a node
$ori = $fnode->childNodes->item(0);
// remove
$fnode->removeChild($ori);
// echo "<xmp>NEW:\n". $xml->saveXML() ."</xmp>";
}
function edit_channel()
{
echo 'Go Edit';
}
For the delete_channel(), nothing is deleted when I run that function. I want each time I use that function, one in xml file ll be deleted.

Answer 1

delete a <channel> with simplexml:
$xml = simplexml_load_file($filename);
// select the channel to be deleted by title
$channel = $xml->xpath("//channel[title='VTC HD2']");
// delete it!
unset($channel[0][0]);
// save it
$xml->asXML($filename);
see it working: https://eval.in/37084