Codigo PHP:

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<?php

      // nombre de archivo

      $file = "comments.txt";

      // valida form
      
      function form_validate () {
            
            if (sizeof($_POST) < 1) return false;
            
            foreach ($_POST as $name => $value) {
                  if (empty($name) || !isset($name)) {
                        return false;
                  }          
            }
            return true;
      }
      
      function blank_replace ($str) {
            return str_replace (" ","|",$str);
      }
      
      function stick_escape ($str) {
            return str_replace ("|"," ",$str);
      }


      if (form_validate()) {
                
            $fp = fopen ($file,"at");
            fwrite ($fp,uniqid(rand(),true)." ".blank_replace($_POST['name'])." ".blank_replace($_POST['comment'])." ");
            fclose ($fp);                  
      }

      if (!file_exists($file)) {
            echo "No existen comentarios... aun!";
      } else {

            $fp = fopen ($file,"r");
      
            while ($info = fscanf ($fp,"%s %s %s ")) {      
                  list ($id,$name,$comment) = $info;
?>

<table border="1" width="47%">
  <tr>
    <td width="26%">Nombre : </td>
    <td width="74%"><?=stick_escape($name)?></td>
  </tr>
  <tr>
    <td width="26%">Comentario:</td>
    <td width="74%"><?=stick_escape($comment)?></td>
  </tr>
</table>
<br>

<?php      
            }      
      }

?>


<hr>

<form action="index.php" method="post">
Nombre :
<br>
<input type="text" name="name">
<br>
Comentario :
<br>
<textarea cols="16" name="comment"> </textarea>
<br>
<input type="submit" value="Enviar!">
</form>


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