Check curl is on 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);

$page=curl_exec($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://localhost"))

echo "Website OK"."n";

/*if site down*/

else

echo "Website DOWN";