[PHP] problema mantenimento valore in campo input

Ciao ragazzi, ho un problema che non riesco a risolvere.

Ho creato un mini-gestionale di esercizio col quale caricare del testo ed una foto.

Il problema è che, nonostante io non le abbia indicate, mi vengono mantenuti i valori nelle variabili $titolo e $corpo generate però solo in UPDATE quando recupero i dati da database.

Sicuramente sbaglio qualcosa di ovvio ma su stò script ormai mi sta andando insieme la vista.

Ho anche un problema di addslashes / stripslashes ma magari lo vediamo dopo.

N.B.
Sò che è un pò lunga ma è abbastanza ben organizzata e separato chiaramente nelle procedure.
Per ogni dubbio chiedetemi che vi indico dove guardare nel codice.

Grazie infinite

Di seguito il codice.

Codice PHP:

<?php

    ### CONNECT ###
    require_once("connect_guestbook2.php");

    
    ### DELETE ###    
    if(isset($_REQUEST["elimina"])){
    
        $sql = "select * from visite where id = '".$_REQUEST['id']."'";
        $result = mysql_query($sql);
        $myrow = mysql_fetch_array($result);        
            
        $foto_grande = "./img/guestbook/".$myrow["foto"];
        $foto_piccola = "./img/guestbook/p_".$myrow["foto"];
                
        if($myrow["foto"] != "" and file_exists($foto_grande)){        
            unlink($foto_grande);        
        }
        
        if($myrow["foto"] != "" and file_exists($foto_piccola)){        
            unlink($foto_piccola);        
        }
            
        $sql = "delete from visite where id = '".$_REQUEST['id']."'";
        $result = mysql_query($sql);            
                
    }
    
    
    ### UPDATE ###
    if(isset($_REQUEST["modifica"])){
    
        $sql = "select * from visite where id = '".$_REQUEST['id']."'";
        $result = mysql_query($sql);
        if($myrow = mysql_fetch_array($result)){
        
            $titolo = htmlentities(stripslashes($myrow["titolo"]));
            $corpo = htmlentities(stripslashes($myrow["corpo"]));
            
            if(isset($_REQUEST["update"])){        
                
                $sql = "update visite set titolo = '".addslashes(trim($_REQUEST["titolo"]))."', corpo = '".addslashes(trim($_REQUEST["corpo"]))."' where id = '".$_REQUEST['id']."'";    
                mysql_query($sql);                              
                
                if(isset($_REQUEST["delete_foto"]) and !isset($_FILES["immagine"])){
                                
                   $foto_grande = "./img/guestbook/".$myrow["foto"];
                  $foto_piccola = "./img/guestbook/p_".$myrow["foto"];
                               
                   if($myrow["foto"] != "" and file_exists($foto_grande) and file_exists($foto_piccola)){                   
                      unlink($foto_grande);
                      unlink($foto_piccola);
                   }            
                    
                    $sql = "update visite set foto = '' where id = '".$myrow["id"]."' ";
                    $result = mysql_query($sql);
                                
                }// delete_foto                
                
                if(is_uploaded_file($_FILES["immagine"]["tmp_name"])){
                    
                   $foto_grande = "./img/guestbook/".$myrow["foto"];
                  $foto_piccola = "./img/guestbook/p_".$myrow["foto"];
                               
                   if($myrow["foto"] != "" and file_exists($foto_grande) and file_exists($foto_piccola)){                   
                      unlink($foto_grande);
                      unlink($foto_piccola);
                   }
                                               
                               
                   $id = $myrow["id"];
                   $tmp_filename = $_FILES["immagine"]["tmp_name"];
                   $filename = $id . "_" . $_FILES["immagine"]["name"];
                   $path = "./img/guestbook/";
                   $pathfile = $path . $filename;
                   
                   if(move_uploaded_file($tmp_filename,$pathfile)){
                   
                  $size = getimagesize($pathfile);
                  $width = $size[0];
                  $height = $size[1];
                  
                      // funzione di resize
                  if($width > $height){
                  
                     $new_width = 100;
                     $new_height = ceil($height * $new_width / $width);
                  
                  } elseif($width < $height){
                  
                     $new_height = 100;
                     $new_width = ceil($width * $new_height / $height);    
                  
                  
                  }elseif($width = $height){
                  
                     $new_width = 100;
                     $new_height = 100;
                  
                  }
                       
                       $thumbnail_pathfile = "./img/guestbook/p_";
                       $thumbnail = imageCreateTrueColor($new_width,$new_height) or die ("impossibile creare la miniatura");
                       $original = imageCreateFromJPEG($pathfile) or die("impossibile aprire l'originale");        
                       imageCopyResampled($thumbnail,$original,0,0,0,0,$new_width,$new_height,$width,$height) or die("impossibile ridimensionare l'immagine");
                       imageJpeg($thumbnail,$thumbnail_pathfile.$filename,80) or die("impossibile salvare la miniatura");
                       imageDestroy($thumbnail);                    
                       
                       $sql = "update visite set foto = '".$filename."' where id = '".$id."'";
                       $result = mysql_query($sql);                                    
                                       
                   }
                        
                }    
                
            }                                            
        
        }                
    
    }
    
    
    ### INSERT ###
    if(isset($_REQUEST["inserisci"])){        
            
        if($_REQUEST["titolo"] != "" and $_REQUEST["corpo"] != ""){
        
            $sql = "insert into visite(titolo,corpo) values('".addslashes(trim($_REQUEST["titolo"]))."','".addslashes(trim($_REQUEST["corpo"]))."')";
            $result = mysql_query($sql);
            if($result){
                
                $id = mysql_insert_id();
                
            }
            
            
            if(is_uploaded_file($_FILES["immagine"]["tmp_name"])){
            
                $tmp_filename = $_FILES["immagine"]["tmp_name"];
                $filename = $id . "_" . $_FILES["immagine"]["name"];
                $path = "./img/guestbook/";
                $pathfile = $path . $filename;
                
                if(move_uploaded_file($tmp_filename,$pathfile)){
                
            $size = getimagesize($pathfile);
            $width = $size[0];
            $height = $size[1];
            
                // funzione di resize
            if($width > $height){
            
               $new_width = 100;
               $new_height = ceil($height * $new_width / $width);
            
            } elseif($width < $height){
            
               $new_height = 100;
               $new_width = ceil($width * $new_height / $height);    
            
            
            }elseif($width = $height){
            
               $new_width = 100;
               $new_height = 100;
            
            }
                    
                    $thumbnail_pathfile = "./img/guestbook/p_";
                    $thumbnail = imageCreateTrueColor($new_width,$new_height) or die ("impossibile creare la miniatura");
                    $original = imageCreateFromJPEG($pathfile) or die("impossibile aprire l'originale");        
                    imageCopyResampled($thumbnail,$original,0,0,0,0,$new_width,$new_height,$width,$height) or die("impossibile ridimensionare l'immagine");
                    imageJpeg($thumbnail,$thumbnail_pathfile.$filename,80) or die("impossibile salvare la miniatura");
                    imageDestroy($thumbnail);                    
                    
                    $sql = "update visite set foto = '".$filename."' where id = '".$id."'";
                    $result = mysql_query($sql);                                    
                                    
                }
                        
            }            
                        
        
        }        
        
    }
    
    
    
?>


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="keywords" content="" />
<meta name="description" content="" />
<meta http-equiv="imagetoolbar" content="no" />
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta http-equiv="revisit-after" content="7 days" />
<meta http-equiv="robots" content="index,follow" />
<meta http-equiv="Cache-Control" content="cache, must-revalidate" />
<meta http-equiv="pragma" content="cache" />
<script language="JavaScript" type="text/javascript" src="js/global.js"></script>

<link rel="stylesheet" type="text/css" href="css/stile.css" />
<title>Guestbook2</title>
</head>
<body>


    <form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data">
        <?php
        if($_GET["modifica"]){
        ?>
        <input type="hidden" name="modifica" value="1" />
        <input type="hidden" name="id" value="<?php echo $myrow['id']; ?>" />
        <?php
        }
        ?>
        <div class="campo">
            <label>Titolo</label>
            <input type="text" class="text" name="titolo" value="<?php echo $titolo; ?>" />
        </div>
        
        <div class="campo">
            <label>Corpo</label>
            <textarea name="corpo"><?php echo $corpo; ?></textarea>
        </div>
        
        <div><input type="file" class="text" name="immagine" /></div>
        <br />
        
        <?php
        if(isset($_REQUEST["modifica"])){
        ?>
            <?php
            if($myrow["foto"] != ""){
            ?>
            <div><input type="checkbox" name="delete_foto" value="1" style="vertical-align:middle;" /> cancella la foto</div>
            <?php
            }
            ?>                    
        <div><input type="submit" name="update" value="modifica" /></div>
        <?php
        }else {
        ?>
        <div><input type="submit" name="inserisci" value="inserisci" /></div>
        <?php
        }
        ?>
    
    </form>

    
    <?php
    $sql = "select * from visite";
    $result = mysql_query($sql);
    if($myrow = mysql_fetch_array($result)){
    ?>
    
        <table class="editor">
            <tr>
                <th width="60">Azioni</th>
                <th width="200">Titolo</th>
                <th width="400">Corpo</th>
                <th width="60">Foto</th>
            </tr>
        <?php
        $n = 1;
        do {
        
        if($n % 2 == 0){        
            $riga = "pari";        
        } else {
            $riga = "dispari";
        }
        
                
        ?>
            <tr class="<?php echo $riga; ?>">
                <td class="middle">
                    
                    <a href="<?php echo $_SERVER['PHP_SELF'] ?>?modifica=1&id=<?php echo $myrow['id'];?>" title="Modifica"><img src="img/modifica.gif" alt="Modifica" /></a>
                    <a href="<?php echo $_SERVER['PHP_SELF'] ?>?elimina=1&id=<?php echo $myrow['id'];?>" title="Elimina"><img src="img/elimina.gif" alt="Elimina" /></a>
                
                </td>
                <td class="top"><?php echo htmlentities(stripslashes(substr($myrow['titolo'],0,100))); ?></td>
                <td class="top"><?php echo htmlentities(stripslashes(nl2br(substr($myrow['corpo'],0,300)))); ?></td>
                <td class="middle">
                    <?php
                    if($myrow['foto'] != ''){
                    
                        if(file_exists("./img/guestbook/".$myrow['foto'])){
                        
                            $size = getImageSize("./img/guestbook/".$myrow['foto']);
                            $width = $size[0];
                            $height = $size[1];                                                        
                        
                        }
                    
                    ?>
                        <a href="java-script:popup('popup.php?id=<?php echo $myrow['id']; ?>','','<?php echo $width ?>','<?php echo $height ?>','')"><img src="./img/guestbook/p_<?php echo $myrow['foto']; ?>" alt="" /></a>
                    <?php
                    }
                    ?>
                </td>            
            </tr>        
        <?php        
        $n++;
        } while($myrow = mysql_fetch_array($result));
        ?>
        
        </table>
        
    <?php
    }            
    ?>
    


</body>
</html>

Ouh ... ho cambiato il nome delle variabilie $titolo e $corpo in $titolo2 e $corpo2 in TUTTO lo script ovvero 2 volte per ciascuna, una in update quando recupero i valori da DB e la senconda nella visualizzazione degli stessi nella form e la cosa va a posto.

Ma come è possibile?!?!