Question

I am have two xml files.. I first get one and loop through it then I need to take an id from the first xml file and find it in the second one and echo out the results associated with that id. If I were to do this with SQL I would simply do this:

$query = (SELECT * FROM HotelSummary WHERE roomTypeCode = '$id') or die();
while($row=mysql_fetch_array($query)){
   $name = $row['Name'];
}
echo $name;

How can I do this is in xml and php??

Answer 1

I recommend you to read the DOMDocument documentation.
It’s quite heavy but also powerful (not always clear what happens, but the Internet shold always give you a solution)

You can simply walk through your first document, finding your Id and then find your DOMElement via an XPath.

<?php
$dom = new DOMDocument();
$dom->load('1.xml');

foreach ($dom->getElementsByTagName('article') as $node) {
    // your conditions to find out the id
    $id = $node->getAttribute('id');
}


$dom = new DOMDocument();
$dom->load('2.xml');

$xpath = new DOMXPath($dom);
$element = $xpath->query("//*[@id='".$id."']")->item(0);

// would echo "top_2" based on my example files
echo $element->getAttribute('name');

Based on following test files:

1.xml

<?xml version="1.0" encoding="UTF-8"?>
<articles>
    <article id="foo_1">
        <title>abc</title>
    </article>
    <article id="foo_2">
        <title>def</title>
    </article>
</articles>

2.xml

<?xml version="1.0" encoding="UTF-8"?>
<tests>
    <test id="foo_1" name="top_1">

    </test>
    <test id="foo_2" name="top_2">

    </test>
</tests>