php dns check

dns-check.php

<?php

function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

$i = 0;
$maxTime = 0;
while (true) {
    $time_start = microtime_float();
    echo $i . PHP_EOL;
    $rec = dns_get_record("facebook.com");
    var_dump($rec);
    $i++;
    $time_end = microtime_float();
    if (!isset($rec[0]['host'])) {
        break;
    }

    $currentTime = $time_end - $time_start;
    echo sprintf('Total time: %f %s', $currentTime, PHP_EOL);
    if ($currentTime > $maxTime) {
        $maxTime = $currentTime;
        echo "Max time regression here!" . PHP_EOL;
        sleep(10);
    }

}