Someone

    <div class="pocitadlo"><span>Počitadlo: 
      <?php
        $cas=time();
        $ip = $_SERVER["REMOTE_ADDR"];
        if(file_exists("pocitadlo.txt"))
          {
            $pocet=file("pocitadlo.txt");
          }
          $a=trim($pocet[0]);
          if(($ip<>trim($pocet[1]))or(($cas-$pocet[2])>86400))
          {
            $a++;
               $fp=fopen("pocitadlo.txt", "w");
                fwrite($fp,$a."\n");
                fwrite($fp,$ip."\n");
                fwrite($fp,$cas);
                fclose($fp);
          }
              echo $a;
      ?>
    </span></div>