The example given bellow,

<?php
echo getPageCount("phpkit.in");
function getPageCount($domain=''){
         $url = "http://www.google.com/search?hl=en&q=site:".$domain."&start=0&sa=N";
         $content =file_get_contents($url);
         $content = strip_tags($content);
         $content = str_replace(array("&nbsp;",'/','-','|','<','>','"',"'",":","(",")",","),"",$content);
         $find ='/^(([^"]*)of about ([^"]*) from '.$domain.'([^"]*))/i';
         preg_match($find, $content , $matches);
         return intval($matches[3]);
    }


?>