function check_alive($url)
{
$url = @parse_url($url);
if (!$url) {
return false;
}
$url = array_map('trim', $url);
$url['port'] = (!isset($url['port'])) ? 80 : (int)$url['port'];
$path = (isset($url['path'])) ? $url['path'] : '';
if ($path == '') {
$path = '/';
}
$path .= (isset($url['query'])) ? "?$url[query]" : '';
if (isset($url['host']) AND $url['host'] != gethostbyname($url['host'])) {
if (PHP_VERSION >= 5) {
$headers = get_headers("$url[scheme]://$url[host]:$url[port]$path");
}
else {
$fp = fsockopen($url['host'], $url['port'], $errno, $errstr, 30);
if(!$fp) {
return false;
}
fputs($fp, "HEAD $path HTTP/1.1\r\nHost: $url[host]\r\n\r\n");
$headers = fread($fp, 128);
fclose($fp);
}
$headers = (is_array($headers)) ? implode("\n", $headers) : $headers;
return preg_match('#^HTTP/.*\s+[(200|301|302)]+\s#i', $headers);
}
return false;
}
