Check if website is online with PHP and Free Mobile (France) / Quick and dirty

CheckOnline.php

<?php
// Sites
$sitesArray[] = "https://silentkernel.fr";
$sitesArray[] = "https://storage.silentkernel.fr";
 
// Users
$usersUrlArray[] = "https://smsapi.free-mobile.fr/sendmsg?user=xxxxxxx&pass=xxxxxxxxxx&msg=";
 
// Begin code
function getResponseInfo($url)
{
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.23");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_exec($ch);
        $info = curl_getinfo($ch);
        curl_close($ch);
        return $info;
}
 
$resultString = "";
 
foreach ($sitesArray as $url)
{
        $info = getResponseInfo($url);
 
        if (!isset($info["http_code"]))
        {
                $resultString.= " ".$url;
        }
        elseif ($info["http_code"] != 200)
        {
                $resultString.= " ".$url;
        }
        // Prevent flooding servers
        sleep(1);
}
 
if ($resultString != "")
{
        $SMS = urlencode("Down :" . $resultString);
//      var_dump($SMS);
 
        foreach ($usersUrlArray as $userUrl)
        {
                getResponseInfo($userUrl . $SMS);
        }
}
?>