Ddoanie token do księgi gości Opcje

[Tom:-)]

Jak do poniższego kodu mam dodać prosty token? Poniższy skrypt to formularz do księgi gości

[PHP] pobierz, plaintext 
<?php
if($_GET[f] == 'edit' && $_GET[ref] != '' && $book[logged] == true) {
  $dane = file($book[katalog].$book[plik]);
  foreach($dane as $linia)
  {
    $dana = explode($book[separator], $linia);
    if($_GET[id]==$dana[0])
    echo'
    <form action="'.$book[katalog].'script.php?q=edit&amp;id='.$_GET[id].'&amp;ref='.$_GET[ref].'" method="post" id="book_form">
    <fieldset><legend>Edytuj wpis</legend>
    <input type="hidden" name="id" value="'.$dana[0].'" /><input type="hidden" name="data" value="'.$dana[1].'" />
    <label for="podpis">Podpis</label><input type="text" id="podpis" name="podpis" value="'.$dana[2].'" /><br />
    <label for="mail">E-mail</label><input type="text" id="mail" name="mail" value="'.$dana[3].'" /><br />
    <label for="www">WWW</label><input type="text" id="www" name="www" value="'.$dana[4].'" /><br />
    <label for="tresc">Treść</label><textarea id="tresc" name="tresc" cols="40" rows="10">'.str_replace('<br />', "\n", $dana[5]).'</textarea><br />
    <input type="submit" value="Edytuj wpis" class="submit" />
    </fieldset>
    </form>';
  }
}
else if($_GET[f] == 'delete' && $_GET[ref] != '' && $book[logged] == true) {
  echo'
  <form id="book_form">
  <fieldset>
  <legend>Usuń wpis</legend>
  <span class="warning">Na pewno usunąć dany wpis?!</span><br />
  <span class="warning">
  <a href="'.$book[katalog].'script.php?q=delete&amp;id='.$_GET[id].'&amp;ref='.$_GET[ref].'">[Tak]</a>
  <a href="'.deref($_GET[ref]).'">[Nie]</a>
  </span>
  </fieldset>
  </form>';
}
else if($_GET[f] == 'login' && $_GET[ref] != '') {
  echo'
    <form action="'.$book[katalog].'script.php?q=login&amp;ref='.$_GET[ref].'" method="post" id="book_form">
    <fieldset><legend>Logowanie</legend>
    <label for="login">Login</label><input type="text" id="login" name="login" /><br />
    <label for="haslo">Hasło</label><input type="password" id="haslo" name="haslo" /><br />
    <input type="submit" value="Zaloguj" class="submit" /></fieldset></form>';
}
else {
echo'
    <form action="'.$book[katalog].'script.php?q=add&amp;ref='.ref().'" method="post" id="book_form">
    <fieldset><legend>Dodaj wpis</legend>
    <label for="podpis">Podpis</label><input type="text" id="podpis" name="podpis" maxlength="100" /><br />';
    if($book[dodaj_mail]==1)echo'
    <label for="mail">E-mail</label><input type="text" id="mail" name="mail" maxlength="100" /><br />';
    if($book[dodaj_www]==1)echo'
    <label for="www">WWW</label><input type="text" id="www" name="www" maxlength="100" /><br />';
echo'
    <label for="tresc">Treść (*)</label><textarea id="tresc" name="tresc"  cols="40" rows="10"></textarea><br />
    <input type="submit" value="Dodaj wpis" class="submit" />
    </fieldset>
    </form>';
}
?>
[PHP] pobierz, plaintext