function delete_subdomain($subDomain,$cPanelUser,$cPanelPass,$rootDomain)
{
    $buildRequest = "/frontend/x3/subdomain/dodeldomain.html?domain=" . $subDomain . "_" . $rootDomain;
 
    $openSocket = fsockopen('localhost',2082);
    if(!$openSocket) {
        return "Socket error";
        exit();
    }
 
    $authString = $cPanelUser . ":" . $cPanelPass;
    $authPass = base64_encode($authString);
    $buildHeaders  = "GET " . $buildRequest ."\r\n";
    $buildHeaders .= "HTTP/1.0\r\n";
    $buildHeaders .= "Host:localhost\r\n";
    $buildHeaders .= "Authorization: Basic " . $authPass . "\r\n";
    $buildHeaders .= "\r\n";
 
    fputs($openSocket, $buildHeaders);
    while(!feof($openSocket)) {
    fgets($openSocket,128);
    }
    fclose($openSocket);
     
    $passToShell = "rm -rf /home/" . $cPanelUser . "/public_html/subdomains/" . $subDomain;
    system($passToShell);
}
- See more at: http://vikku.info/programming/php/create-subdomain-dynamically-in-php-code-to-create-subdomains-in-server-using-php.htm#sthash.gg06VlWs.dpuf