How to update this xml file with PHP XML reader & writer?

Question

I have the following sitemap XML which contains a list of URLs to be submitted for search engines. I took this example code from another SO answer.

// Init XMLWriter
$writer = new XMLWriter();
$writer->openURI(APPLICATION_PATH . '/sitemap.xml');

// document head
$writer->startDocument('1.0', 'UTF-8');
$writer->setIndent(4);
$writer->startElement('urlset');
$writer->writeAttribute('xmlns', 'http://www.sitemaps.org/schemas/sitemap/0.9');

// Write something
// this will write: <url><loc>some url here;  SO not allowed me</loc></url>
$writer->startElement('url');
$writer->writeElement('loc', 'some url here; SO not allowed me');
$writer->endElement();

// end urlset
$writer->endElement();
// end document
$writer->endDocument();

This code creates a new sitemap using XML writer. I want to append new url to existing urlset using XMLReader

$reader = new XMLReader();
if (!$reader->open('sitemap.xml')){
    die("Failed to open 'sitemap.xml'");
}
while($reader->read()){
    if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == 'urlset') {
        $writer->startDocument('1.0', 'UTF-8');
        $writer->startElement('url');
        $writer->writeElement('loc', 'http://www.test.com');
        $writer->endElement();
        break;
    }
}
$reader->close();

I could not find proper samples on how to update xml file with XMLreader. How can I rewrite this code so that it appends new URLs to url set tag using XMLreader?

Edit 1:

I have this xml sitemap,

<?xml version="1.0" encoding="UTF-8"?>
<urls>
    <url>
     <loc>http://www.bbc.com</loc>
    </url>
</urls>

I want the program to add one new url at the urls tag like this eg. adding URL google.com,

<?xml version="1.0" encoding="UTF-8"?>
<urls>
    <url>
     <loc>http://www.bbc.com</loc>
    </url>
    <url>
     <loc>http://www.google.com</loc>
    </url>
</urls>

How could I get this functionality or is there some other helpers like DOMDocument or simplexml to do that in PHP? Any references to others sites is also welcome.

I need to open the sitemap.xml using XMLReader, create new url listing and append to existing urlset, then save XML file and close the connection. — webblover
– webblover, Commented Nov 1, 2014 at 18:08
Maybe, but you just keep posting comments instead of making edits. — Flexo - Save the data dump
– Flexo - Save the data dump ♦, Commented Nov 2, 2014 at 4:15

Ohgodwhy · Accepted Answer · 2014-11-01 18:20:46Z

1

XMLWriter is not good for this methodology. You should use a different library, like simplexml for instance.

With that, it's very simple. Although I don't know what your doc structure looks like, let's take a stab at it:

//load the file for our manipulating
$xml = simplexml_load_file($file);

//grab the parent element that we want to append to
$urls = $xml->urls;

//add a new child called Url
$newUrl = $urls->addChild('url');

//add a new child called loc to the new child Url we just created, add a link to yahoo
$newUrl->addChild('loc', 'http://www.yahoo.com');

//write the output
$xml->asXML($xml);

Here's an eval.in example

answered Nov 1, 2014 at 18:20

Ohgodwhy

50.8k11 gold badges86 silver badges114 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

webblover Over a year ago

Thanks, good answer. But I just heard today that simpleXML loads full XML file into memory and depress efficiency. consider in case that the XML file contains 40,000 URLs, it has to load every thing into memory before updating the XML. What do you think?

Ohgodwhy Over a year ago

@webblover Yep..this is true. I'll find a different approach given those circumstances. Give me a few minutes. :)

JFouad · Accepted Answer · 2014-11-16 13:53:05Z

1

I waiting for a good response, I have the some problem (xml file with over 50.000 elements) and I would like to add element without load full xml in memory

answered Nov 16, 2014 at 13:53

JFouad

5716 silver badges12 bronze badges

Collectives™ on Stack Overflow

How to update this xml file with PHP XML reader & writer?

2 Answers 2

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related