looking for simple backlink checker

Will pay my last 7$ paypal for something basic, pm me for details

 

How do you check for google backlinks? Isn't there a specific command you can put into google like site:yoursite.com?

 

It's link:sitename.com

 

<?php
$domain = "digitalpoint.com"; // Domain to check backlinks

$url = "http://www.google.com/search?q=link%3A".$domain;
$file = file_get_contents($url);
if (!strstr($file,'did not match any documents')) {
 $linksto = strstr($file,"of about <b>");
 $linksto = substr($linksto,strlen("of about <b>"));
 $linksto = str_replace(strstr($linksto,'</b>'),'',$linksto);
 echo $linksto.' backlinks';
}
else
{
 echo 'No backlinks';
}
?>

PHP:

No charge Your welcome.

 

Thanks guys, however I need fo one who checks if backlink on specific sites are alive and linking to other specific sites.
For instance to check if site X links to site Y, if site Z links to site U and so on.