Simplexml : xpath with three conditions - php

Question

I have a xml file like this :
<rss version="2.0" xmlns:atom="https://www.w3.org/2005/Atom">
<channel>
<item>
<city>London</city>
<description>Trip</description>
<link>page.php</link>
<img>img.jpg</img>
</item>
<item>
<city>London</city>
<description>Trip</description>
<link>page.php</link>
<img>img.jpg</img>
</item>
<item>
<city>Paris</city>
<description>Trip</description>
<link>page.php</link>
<img>img.jpg</img>
</item>
.
.
</channel>
</rss>
If I want to select TRIP in LONDON, I do that :
<?php
$xml = simplexml_load_file('file.xml');
$items = $xml->xpath('//item[city[contains(.,"London")] and description[contains(.,"Trip")]]');
foreach($items as $item){
echo ' txt ';
}
?>
If I want to select ONLY the first TRIP in LONDON, I do that :
<?php
$xml = simplexml_load_file('file.xml');
$items = $xml->xpath('//item[city[contains(.,"London")] and description[contains(.,"Trip")]]')[0];
foreach($items as $item){
echo ' txt ';
}
?>
I try also 1 instead of 0, and this
[position()=0]
it does not work.
What's wrong ?
I keep looking.
I have made several tests only with the position filter, for example :
<?php
$xml = simplexml_load_file('site-alpha.xml');
$items = $xml->xpath('//(/item)[1]');
foreach($xml->channel->item as $item){
echo '<div>....</div>';
}
?>
And it doesn't work.
I think I have a problem with this part, but I don't see where.

Answer 1

<?php
// Load the XML file
$xml = simplexml_load_file('your_xml_file.xml');
// Iterate through each "item" element
foreach ($xml->item as $item) {
// Output the description and city
echo $item->description . ' in ' . $item->city . '<br>';
}
?>

Answer 2

Unlike php, xpath indexing start from "1".
So either of these should get you only the first trip:
#indexing is indicated inside the xpath expression so it starts with 1:
$items = $xml->xpath('//item[city[contains(.,"London")] and description[contains(.,"Trip")]][1]');
or
#indexing is indicated outside the xpath expression so it's handled by php and starts with 0:
$items = $xml->xpath('//item[city[contains(.,"London")] and description[contains(.,"Trip")]]')[0];