Look through list of domains to see if PageSpeed service is enabled

pagespeed_checker.php

#!/usr/bin/env php
<?php

/**
 * List of domains on the level where your CNAME would exist
 */
$domains = [
];

echo PHP_EOL;

/**
 * Cycle through domains and output those who have PageSpeed installed
 */
foreach ($domains as $domain) {
    if (hasPageSpeedEnabled($domain)) {
        echo 'PageSpeed Installed: ' . $domain . PHP_EOL;
    }
}

/**
 * See if the CNAME for PageSpeed is setup on $domain
 *
 * @param string $domain
 *
 * @return bool
 */
function hasPageSpeedEnabled($domain)
{
    $resp = dns_get_record($domain, DNS_CNAME);

    if (!count($resp)) {
        return false;
    }

    foreach ($resp as $cname) {
        if (strpos($cname['target'], 'pagespeed') !== false) {
            return true;
        }
    }

    return false;
}