Automatic Cronjob for Sitemap submission

Made this recently and I figured this might be easy for some of you. Just upload the script to your server only edit the sitemap url and attach it to a cronjob that works like 1 time every day. It submits to google, bing, yahoo and ask.

<?php
	$sm_url = "http://mydomainname.extension/sitemap.xml";
	
	$se_list = array("http://www.google.com/webmasters/sitemaps/ping?sitemap=",
					 "http://www.bing.com/webmaster/ping.aspx?siteMap=",
					 "http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=YahooDemo&url=",
					 "http://submissions.ask.com/ping?sitemap=");

		
	foreach($se_list as $i){
		$url_to_ping = $i . $sm_url;

		if ($i == "http://www.google.com/webmasters/sitemaps/ping?sitemap=") {
			$host = "Google";
		} elseif ($i == "http://www.bing.com/webmaster/ping.aspx?siteMap=") {
			$host = "Bing";
		} elseif ($i == "http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=YahooDemo&url=") {
			$host = "Yahoo";
		} else {
			$host = "Ask";
		}	

		$data = file_get_contents($url_to_ping);

		if ($data) {
		          // do something if succeeded
		} else {
		          // do something if failed, like mail yourself of a submit failure to specific $host
		}

	}	
?>

PHP:

 

Or just add the sitemap to robots.txt?

 

guess not every website is crawled every day?

 

The search engines cache the sitemap address practically forever.
Pinging every day is completely pointless.