php根据ip段以及子网掩码，判断某ip是否处于某子网下

function ip_binay($ip)
{
        $ip_array = explode(".",$ip);
        $t = ‘‘;
        foreach($ip_array as $v)
        {
                $tmp = decbin($v);
                $tmp_len = strlen(decbin($v));
                if($tmp_len < 8)
                        $t .= str_repeat( "0",(8 - $tmp_len) ).$tmp;
                else
                        $t .= $tmp;
        }
        return $t;
}
$server_ip = "0.0.0.0"; //地址段
$mask_ip = "0.0.0.0"; //子网掩码
 
$client_ip=‘192.168.1.11‘;//客户端ip
 
$D=ip_binay($client_ip);
$is_ip_in=0;
$M = ip_binay($mask_ip);
$temp = $D & $M;
$N = ip_binay( $server_ip );
if( $temp == $N ){
    $is_ip_in=1;
}
 
if($is_ip_in){
    echo "你的ip处于该网络下！";
}else{
    echo ‘NO‘;
}