How to validate existing url using Curl

$url = ‘http://google.com’;

$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);

$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

// print_r(curl_getinfo($ch));die;
curl_close($ch);
if($httpcode>200) {
echo ‘url exist’;
}
else{
echo ‘url not exist’;
}