Warmup from sitemap xml

sitemap-xml-warmup.php

<?php

exit; // change url first

$mainXmlUrl = 'https://www.example.com/sitemap.xml';

$mainXmlContent = curlUrlExec($mainXmlUrl);
$mainXml = @simplexml_load_string($mainXmlContent);
unset($mainXmlContent);


$urls = [];

// check if its an normal sitemap xml 
if (isset($mainXml->url))
{
    $urls[] = $mainXmlUrl;
}
// check if its an sitemapindex xml
if (isset($mainXml->sitemap))
{
    foreach ($mainXml->sitemap as $sitemap)
    {
        $urls[] = (string)$sitemap->loc;
    }
}
unset($mainXml);

// parse XML and URLs :)
foreach ($urls as $url) {
    logLine("URL: $url");
    $xmlContent = curlUrlExec($url);
    $xml = @simplexml_load_string($xmlContent, 'SimpleXMLElement', LIBXML_COMPACT | LIBXML_PARSEHUGE);
    unset($xmlContent); // free memory before
    if (!isset($xml->url))
    {
        continue;
    }
    foreach ($xml->url as $value)
    {
        logLine($value->loc, $url);
        curlUrlExec((string)$value->loc);
        logLine('DONE: '.$value->loc, $url);
    }
    unset($xml); // free memory before
}

/**
 * 
 * @param string $msg
 */
function logLine($msg, $part = 'default')
{
    $part = basename((string)$part);
    echo date('r').': ['.(string)$part.'] '.(string)$msg."\n";
}

/**
 * 
 * @param string $url
 * @return type
 */
function curlUrlExec($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, trim($url));
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $result = curl_exec($ch);
    curl_close($ch);
    if (pathinfo($url, PATHINFO_EXTENSION) == 'gz')
    {
        $result = gzdecode($result);
    }
    return $result;
}