php屏蔽ip或ip段

//ip屏蔽
    $userip = getRealIpAddr();//获取用户真实ip
    $ipreg='/((?:\d+\.){3})\d+/';//1个*
    //$ipreg2='~(\d+)\.(\d+)\.(\d+)\.(\d+)~'; //2个*
    $useripd = preg_replace($ipreg,"\\1*",$userip);//获取ip段
    $shield = explode("\n",$ip);//屏蔽的ip转换为数组
    foreach($shield as $val){
        $shieldip[] = trim($val);
    }
    if (in_array($userip, $shieldip) || in_array($useripd, $shieldip)){
      echo "ip已被禁用！";die;
    }

注：getRealIpAddr() 函数在https://www.weivb.com/article/36.html本篇文章中已有