ini_set('max_execution_time', 0);

    function curl_get($url , $timeout = 0)
    {
        $user_agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";
                  
        $ch = curl_init();
        
        curl_setopt($ch, CURLOPT_USERAGENT, $user_agent); 
        
        curl_setopt ($ch, CURLOPT_URL, $url);
        
        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        
        curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
    
        $xml = curl_exec($ch);
        
        curl_close($ch);
        
    return $xml;
    }

$sitemap_url = 'sitemap.xml';

$title = "Feed Back"; 

$url[0] = "http://www.google.com/webmasters/tools/ping?sitemap=".urlencode($sitemap_url);
$url[1] = "http://www.bing.com/webmaster/ping.aspx?siteMap=".urlencode($sitemap_url);
$url[2] = "http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=YahooDemo&url=".urlencode($sitemap_url);
$url[3] = "http://submissions.ask.com/ping?sitemap=".urlencode($sitemap_url);
$url[4] = "http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=".urlencode($sitemap_url);
$url[5] = "http://webmaster.live.com/ping.aspx?siteMap=".urlencode($sitemap_url);
$url[6] = "http://rpc.weblogs.com/pingSiteForm?name=".urlencode($title)."&url=".urlencode(HOST)."&changesURL=".urlencode($sitemap_url); 

foreach($url as $key => $value)
{
	$xml = curl_get($value); 
}