Why this function not working as excepted

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PHP

cURL

I have been working for hours to get this works the problem is that when I first execute this code everything is ok but second time nothing displays. Then I realized that if I wait 20-25 seconds gets executed as expected I am using this way

whois("google","web.tr")

I dont get any problem the other extensions(com,net) so on

What I have tried:

function whois($domainName, $ext)
{
    $servers = array(
        "biz" => "whois.neulevel.biz",
        "com" => "whois.internic.net",
        "us" => "whois.nic.us",
        "info" => "whois.nic.info",
        "name" => "whois.nic.name",
        "net" => "whois.internic.net",
        "tv" => "whois.nic.tv",
        "ru" => "whois.ripn.net",
        "org" => "whois.pir.org",

        "com.tr" => "whois.nic.tr",
        "gen.tr" => "whois.nic.tr",
        "web.tr" => "whois.nic.tr",
        "k12.tr" => "whois.nic.tr",
        "org.tr" => "whois.nic.tr"
    );
    $serverName = trim($servers[$ext]);
    $tamAd=$domainName.".".$ext;
    $whois = array();




    $output = "";
    if (function_exists('curl_version')) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $serverName);
        curl_setopt($curl, CURLOPT_PORT, 43);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_TIMEOUT, 5);
        curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $tamAd. "\r\n");
        $result = curl_exec($curl);




        curl_close($curl);
        print_r($result);
    } else {
        trigger_error('cURL is not found!');
        exit();
    }




}
whois("google","web.tr");