<?php

 require 'shoutbox.php';
 $ajax = array();

 $author = $_POST["shout_name"];
 $text   = $_POST["shout_text"];

 $ip_user = $_SERVER["REMOTE_ADDR"];

 $user_list = array();
 $ban_list = array();

 $access = false;
 $ban = false;

// -

 // pridavani IP adreas + jmen pro rezervaci jmena. 
 $user_list = array(
      "SamerLP" => "178.41.35.189",  
      "RisoPC" => "213.215.107.130",
      "Puckoland" => "213.215.114.56",
      "Zombi" => "213.215.107.130",
      "Nurburing" => "85.159.104.174", 
    );
   
// -

 // pridavani IP adres pro blokaci, ip adresy od jmen ziskas v databazi...
 $ban_list = array(
      //"78.111.124.219", 
   );

// -
    
   if(!empty($author) && !empty($text)) {

       foreach($ban_list as $ban) 
       {
          $ban = ($ban == $ip_user) ? true : false; 
       }

       foreach($user_list as $user => $ip) 
       {
         if(trim(strtolower($author)) == trim(strtolower($user))) 
         {
           $access = ($ip_user == $ip) ? true : false;
        }
        else {
          $access = true;
        }
      }
 
    if ($access && (!$ban)) 
    { 
      $mysqli->query("INSERT INTO shoutbox(name,date,content,ip) VALUES(
        '".$mysqli->real_escape_string(htmlspecialchars($author))."',
        '".time()."',
        '".$mysqli->real_escape_string(htmlspecialchars($text))."',
        '".$_SERVER["REMOTE_ADDR"]."'
      )");
      echo "<meta http-equiv='refresh' content='0; url=shoutbox.php'>";
    }
     else {
      echo "<script> alert('Neopravnena autorizace'); </script>";
    }   
  }
     if(!empty($author) && !_empty($text)) {

function _empty($str)
{
    return (strlen(trim($str)) < 1 ? true : false);
}

// príklad:

$meno = '   ';

if(_empty($meno))
    echo 'ccc'; // čo sa aj vypíše, lebo $meno je prázdne (medzery sa vymažú) 
    }   
  }