PHP CURL Ping函数与现有主机失败

This is my PHP CURL function for pinging hosts:

function ping_url($host)
{

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $host);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT,10);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 10);
$httpResponse = curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);

if(!$httpResponse or empty($httpResponse)) {
return false;   
}

return true;

}

It works for the majority of domains. However, today I tried the following:

if (!ping_url('zapper.com')) {
echo 'false';   
} else {
echo 'true';    
}

and it keeps failing.

Any ideas why this could be happening? The website zapper.com exists.

Thank you!

Try to add this option:

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

Hope it can help you.