domain available php

wheater.php

function isDomainAvailible($domain)
{
    //check, if a valid url is provided
    if(!filter_var($domain, FILTER_VALIDATE_URL))
    {
        return false;
    }

    //initialize curl
    $curlInit = curl_init($domain);
    curl_setopt($curlInit,CURLOPT_CONNECTTIMEOUT,10);
    curl_setopt($curlInit,CURLOPT_HEADER,true);
    curl_setopt($curlInit,CURLOPT_NOBODY,true);
    curl_setopt($curlInit,CURLOPT_RETURNTRANSFER,true);

    //get answer
    $response = curl_exec($curlInit);

    curl_close($curlInit);

    if ($response) return true;

    return false;
}