update child node xml php from another child - php

Question

please help.
I have XML file which is not filled correctly (some values are missed)
Bad example of XML
<?xml version="1.0"?>
<csv_data>
<row>
<brand>Maxxis</brand>
<code>1126668/02</code>
<articul_brand></articul_brand>
<tiporazmer></tiporazmer>
<name>(26/9.00 R12) 6PR TL</name>
<model>M-966 Mudzilla</model>
<sklad_msk></sklad_msk>
<sklad_nahabino></sklad_nahabino>
<sklad_chelny>8</sklad_chelny>
<price_big_opt>6,786р.</price_big_opt>
<price_small_opt>7,100р.</price_small_opt>
<price_retail>8,170р.</price_retail>
</row>
</csv_data>
Good example of XML
<?xml version="1.0"?>
<csv_data>
<row>
<brand>Metzeler</brand>
<code>ЦО04257/21</code>
<articul_brand>2491500</articul_brand>
<tiporazmer>110/80R18</tiporazmer>
<name>(110/80 R18) 58W TL (M) Front</name>
<model>Roadtec Z8</model>
<sklad_msk></sklad_msk>
<sklad_nahabino>2</sklad_nahabino>
<sklad_chelny></sklad_chelny>
<price_big_opt>7,720р.</price_big_opt>
<price_small_opt>8,106р.</price_small_opt>
<price_retail>9,270р.</price_retail>
</row>
</csv_data>
The point is that values in <tiporazmer></tiporazmer> are missed in bad example but they can be found in <name>(26/9.00 R12) 6PR TL</name>
The question is how to update fields <tiporazmer></tiporazmer> using name filed? Copy that without brackets? How?
What I did, but i've got an error Fatal error: Call to a member function getElementsByTagName() on a non-object in
Code:
<?php
$xml = new DOMDocument('1.0', 'utf-8');
$xml->formatOutput = true;
$xml->preserveWhiteSpace = false;
$xml->load('test2.xml');
$new_tiporazmer="26/9.00 R12";
//Get item Element
$element = $xml->getElementsByTagName('rows')->item(0);
//Load child elements
$tiporazmer = $element->getElementsByTagName('tiporazmer')->item(0);
//Replace old elements with new
$element->replaceChild($tiporazmer, $new_tiporazmer);
?>

Answer 1

The error is caused because you're calling getElementsByTagName('rows'), but the name of your XML node is row, so there shouldn't be an s in rows
Then in order to Replace old elements with new, you will need to use nodeValue instead of replaceChild unless you already have a constructed DOMDocument object ready.
But a better way to achieve what you want is to simply find the element by name directly, replace its text, and then save as a new file. I saved to the "/tmp" folder because permissions are usually writeable there on unix systems, but you can write anywhere your php interpreter is allowed.
<?php
$xml = new DOMDocument('1.0', 'utf-8');
$xml->formatOutput = true;
$xml->preserveWhiteSpace = false;
$xml->load('test2.xml');
$new_tiporazmer="26/9.00 R12";
//Get item Element and Replace old elements with new
$xml->getElementsByTagName('tiporazmer')->item(0)->nodeValue = $new_tiporazmer;
//Save as new file
$xml->save("/tmp/good.xml");
This results in good.xml:
<?xml version="1.0"?>
<csv_data>
<row>
<brand>Maxxis</brand>
<code>1126668/02</code>
<articul_brand/>
<tiporazmer>26/9.00 R12</tiporazmer>
<name>(26/9.00 R12) 6PR TL</name>
<model>M-966 Mudzilla</model>
<sklad_msk/>
<sklad_nahabino/>
<sklad_chelny>8</sklad_chelny>
<price_big_opt>6,786р.</price_big_opt>
<price_small_opt>7,100р.</price_small_opt>
<price_retail>8,170р.</price_retail>
</row>
</csv_data>