rss.php

<?php
error_reporting(E_ALL);

$context = stream_context_create([
    'http' => [
        'method' => 'GET',
        'header' => "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.82 Safari/537.36\r\n"
    ]
]);

$xml = file_get_contents("https://dev.to/feed/tag/php",false,$context);

final class RSSItem
{

    public function __construct(
        public readonly string $title,
        public readonly string $creator,
        public readonly DateTimeInterface $pubDate,
        public readonly string $link,
        public readonly string $guid,
        public readonly string $description,
        public readonly array $category
    ) {
    }

}

$domDocument = new DOMDocument();
$domDocument->loadXML($xml);

$xpath = new DOMXPath($domDocument);
$items = $xpath->query('/rss/channel/item');
$rssItems = [];
/** @var DOMNode $item */
foreach($items as $item){
    $variables = [];
    foreach($item->childNodes as $childNode){
        if (!$childNode instanceof DOMElement) {
            continue;
        }
        $tagName = str_replace($childNode->prefix.':','',$childNode->tagName);
        if($tagName === 'pubDate'){
            $variables[$tagName] = new DateTimeImmutable($childNode->nodeValue);
            continue;
        }
        if($tagName === 'category'){
            $variables[$tagName][] = $childNode->nodeValue;
            continue;
        }
        $variables[$tagName] = $childNode->nodeValue;
    }
    $rssItems[]= new RSSItem(...$variables);


}
var_dump($rssItems);