Sitemap VS reader

<?php

/**
 * Either edit the $sites array, or make a sites.txt file in the same directory and
 * comment out the $sites array and uncomment the line below
 */

$sites = array(
    'https://www.androidcentral.com/',
    'https://handsetexpert.com/'
);

// $sites = explode("\n", file_get_contents(__DIR__ . '/sites.txt'));

$urls = [];
foreach ($sites as $site) {
    $urls = array_merge($urls, fetchUrls(rtrim($site, '/') . '/sitemap.xml'));
}

$counts = [
    'match' => 0,
    'no_match' => 0,
    'perc' => 0
];

foreach ($urls as $url) {
    if (preg_match('/(.*?)(\-|_)vs(\-|_)(.*?)/i', $url) == true) {
        $counts['match']++;
    } else {
        $counts['no_match']++;
    }
}

$counts['perc'] = round(($counts['match'] / ($counts['match'] + $counts['no_match'])) * 100, 2) . '%';

print_r($counts);

function fetchUrls(string $sitemapUrl)
{
    $content = file_get_contents($sitemapUrl);

    preg_match_all('/<loc>(.*?)<\/loc>/', $content, $urls);

    $final = $urls[1] ?? [];

    foreach ($final as $url) {
        if (stripos($url, 'sitemap') !== false) {
            $final = array_merge($final, fetchUrls($url));
        }
    }

    return $final;
}