/**
* Send ICMP ECHO_REQUEST to network host using system binaries.
* Returns an array containing ping times in milliseconds for each request.
* This method may fail, if:
* - Web server has no access to system "ping" binary (eg. runs in chrooted mode)
* - ICMP ping requests are blocked by the firewall
* - shell_exec() function is disabled in php.ini
* @param string $host Hostname or IP address
* @param int $count Stop after sending count ECHO_REQUEST packets
* @return array
*/
function icmp_ping($host, $count = 3)
{
$ping_result = array();
$host = trim($host);
if ($host != '' && $count > 0) {
$os = PCPIN_Common::guessOS();
$result = false;
switch ($os) {
case 'windows':
$result = shell_exec('ping -n ' . $count . ' ' . $host);
break;
case 'unix':
$result = shell_exec('ping -c ' . $count . ' ' . $host);
break;
}
// Parse result
if (!empty($result)) {
$data = explode("\n", str_replace("\r", "\n", $result));
foreach ($data as $line) {
$line = strtolower($line);
if (false !== strpos($line, 'ms') && false !== strpos($line, 'ttl') && (false !== strpos($line, '=') || false !== strpos($line, '<'))) {
$parts = explode('=', str_replace('<', '=', $line));
foreach ($parts as $part) {
if (false !== strpos($part, 'ms')) {
$ping_result[] = trim(substr($part, 0, strpos($part, 'ms')));
break;
}
}
}
}
}
}
return $ping_result;
}
