function.php

vpn虚拟专用网络的一个开源搭建工具

<?
function CalculateIPRange($QRange1, $QRange2, $host) {

	//basic error handling to see if it is generally a valid IP in the form N.N.N.N
	if ( preg_match("/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/",$QRange1) != 1 ) return array(-1);
	if ( preg_match("/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/",$QRange2) != 1 ) return array(-1);

	$quad1 = explode(".",$QRange1);
	$quad2 = explode(".",$QRange2);

	reset ($quad1);
	while (list ($key, $val) = each ($quad1)) {
		$quad1[$key] = intval($val);
		if ($quad1[$key] < 0 || $quad1[$key] > 255) return array(-2);
	}
	reset ($quad2);
	while (list ($key, $val) = each ($quad2)) {
		$quad2[$key] = intval($val);
		if ($quad2[$key] < 0 || $quad2[$key] > 255) return array(-2);
	}

	$startIP_long = sprintf("%u",ip2long($QRange1));
	$endIP_long = sprintf("%u",ip2long($QRange2));
	$difference = $endIP_long - $startIP_long;

	$k = 0;
	for ($i = $startIP_long; $i <= $endIP_long; $i++, $k++) {
		if ($k == $host) $ip = long2ip($i);
	}

	return $ip;
}

function redirect($url, $seconds = FALSE)
{
    if (!headers_sent() && $seconds == FALSE)
    {
        header("Location: " . $url);
    }
    else
    {
        if ($seconds == FALSE)
        {
            $seconds = "0";
        }
        echo "<meta http-equiv=\"refresh\" content=\"$seconds;url=$url\">";
    }
}
?>