Check if website is available with PHP

    <?php

           if (isDomainAvailible('/'))
           {
                   echo "Up and running!";
           }
           else
           {
                   echo "Woops, nothing found there.";
           }

           //returns true, if domain is availible, false if not
           function isDomainAvailible($domain)
           {
                   //check, if a valid url is provided
                   if(!filter_var($domain, FILTER_VALIDATE_URL))
                   {
                           return false;
                   }

                   //initialize curl
                   $curlInit = curl_init($domain);
                   curl_setopt($curlInit,CURLOPT_CONNECTTIMEOUT,10);
                   curl_setopt($curlInit,CURLOPT_HEADER,true);
                   curl_setopt($curlInit,CURLOPT_NOBODY,true);
                   curl_setopt($curlInit,CURLOPT_RETURNTRANSFER,true);

                   //get answer
                   $response = curl_exec($curlInit);

                   curl_close($curlInit);

                   if ($response) return true;

                   return false;
           }
    ?>

    <?php
    function Visit($url){
           $agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";$ch=curl_init();
           curl_setopt ($ch, CURLOPT_URL,$url );
           curl_setopt($ch, CURLOPT_USERAGENT, $agent);
           curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
           curl_setopt ($ch,CURLOPT_VERBOSE,false);
           curl_setopt($ch, CURLOPT_TIMEOUT, 5);
           curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE);
           curl_setopt($ch,CURLOPT_SSLVERSION,3);
           curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, FALSE);
           $page=curl_exec($ch);
           //echo curl_error($ch);
           $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
           curl_close($ch);
           if($httpcode>=200 && $httpcode<300) return true;
           else return false;
    }
    if (Visit("http://www.google.com"))
           echo "Website OK"."n";
    else
           echo "Website DOWN";
    ?>

    <?php
           ini_set("default_socket_timeout","05");
           set_time_limit(5);
           $f=fopen("/","r");
           $r=fread($f,1000);
           fclose($f);
           if(strlen($r)>1) {
           echo("<span class='online'>Online</span>");
           }
           else {
           echo("<span class='offline'>Offline</span>");
           }
    ?>