php-常用工具-判断IP是否在某个网络内

/**
 * 判断IP是否在某个网络内 
 * @param $ip   192.168.0.128
 * @param $network 192.168.0.1/24
 * @return bool
*/

function ip_in_network($ip, $network)
{
    $ip = (double) (sprintf("%u", ip2long($ip)));
    $s = explode('/', $network);
    // p($s);die;
    $network_start = (double) (sprintf("%u", ip2long($s[0])));
    $network_len = pow(2, 32 - $s[1]);
    $network_end = $network_start + $network_len - 1;

    if ($ip >= $network_start && $ip <= $network_end)
    {
        return true;
    }
    return false;
}