bool isup(str $server, int $port) // check to see if a server is reachable

gistfile1.php

function isup($server,$port=80) {
	if ($port==80||$port==2222||$port==2083) {
		$up = @file_get_contents('http://' . $server . ':' . $port);
		if (!$up) {
			$up = @file_get_contents('http://' . $server . ':' . $port);
		}
	} else {
		$up =  @fsockopen($server, $port, $errno, $errstr, 2);
		if (!$up) {
			$up =  @fsockopen($server, $port, $errno, $errstr, 2);
		}
	}
	if (!$up) {
		unset($up);
		return false;
	} else {
		unset($up);
		return true;
	}
}