Sì certo, ho usato tutto il codice. Ma non succede nulla.
Questo e il copia/incolla della parte incriminata...

Codice PHP:
 <?php
                    $sqlSelect 
"SELECT * FROM wrin WHERE modulo = '$modulo' ";
                    
$result mysqli_query($conn$sqlSelect);

                    
$path 'pdf/'.$modulo;
                    foreach (new 
RecursiveIteratorIterator(new RecursiveDirectoryIterator($path)) as $file
                    { 
                        
$files[] = $file->getFilename();
                    } 

                    if (
mysqli_num_rows($result) > 0)
                    {
                    
?>
                    <table class="table table-sm" width="145%">
                        <thead>
                            <tr>
                                <th>Wrin</th>
                                <th>Descrizione</th>
                                <th>Contenuto</th>
                                <th>Quantità</th>
                                <th>Note</th>
                            </tr>
                        </thead>
                        <tbody>
                    <?php
                    
while ($row mysqli_fetch_assoc($result)) 
                    {
                        
$soggetto $row['modulo']."_".$row['wrin'];

                        
$class in_array($soggetto$files) ? 'pdfbassa' 'nopdfbassa';

                        echo 
"<tr class='testo_light2 " $class "'>
                                <td>"
.$row['wrin']."</td>
                                <td>"
.$row['descrizione']."</td>
                                <td>"
.$row['contenuto']."</td>
                                <td>"
.$row['quantita']."</td>
                                <td>"
.$row['note']."</td>
                              </tr>"
;    
                    }
                    
?>
                    </table>
                <?php