[PHP] Скрипт проверки доступности сайта

$url = array(
		'http://site1.com/',
		'http://site2.com/',
		'http://site3.com/',
		'http://site4.com/'
);
 
foreach ($url as $val)
{
	$answer = check_http_status($val);
	if ($answer == 200)
		echo 'Site '.$val.' is avaliable.', PHP_EOL;
	else
	{
		if ($answer == 28) // See code status - http://curl.haxx.se/libcurl/c/libcurl-errors.html
		{
			echo 'Resource '.$val.' is not responding. Time out operation (more than 10 sec)'. PHP_EOL;
			// Sending notification
			$from = "test@test.com";
			$to = "admin@test.com";
			$subject = "Resource is not available";
			$message = "Resource $val is not available.\r\nHTTP status: $answer";
			mail($to, $subject, $message,"Content-type:text/plain; charset = UTF-8\r\nFrom:$from");
 
		}
		else
		{
			echo 'Resource '.$val.' is not avaliable. Reason: '.$answer.'. ', PHP_EOL;
			// Sending notification
			$from = "test@test.com";
			$to = "admin@test.com";
			$subject = "Resourceis not available";
			$message = "Resource $val is not available.\r\nHTTP status: $answer";
			mail($to, $subject, $message,"Content-type:text/plain; charset = UTF-8\r\nFrom:$from");
		}
	}
}
 
function check_http_status($url)
{
	$user_agent = 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)';
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_VERBOSE, false);
	curl_setopt($ch, CURLOPT_TIMEOUT, 10);
	$page = curl_exec($ch);
 
	$error = curl_errno($ch);
	if (!empty($error))
		return $error;
 
	return ($httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE));
	curl_close($ch);
}