PHP: MPDF export from multiple textares/textboxes

Question

So, I'm using MPDF to export data/content from one textarea. It works perfectly fine for one textarea, but what happens when I need to export multiple texboxes with a button click? Doing it this way (as shown below) it only exports the last textarea only. I need your help to figure this out how to export from multiple textareas. Thank you.

My form. The textareas with its content is being echoed/displayed using a while loop as shown below.

<form method='post' action='thanks.php' enctype="multipart/form-data">

  <?php
  while ($rows = mysqli_fetch_assoc($result)) {
  ?>

  <textarea name="editor" id="editor">
  <?= $rows['Content']; ?>
  </textarea><br>

  <input type="submit" name="export" value="Export" id="export" class="btn third">

  <?php
  }
  ?>

</form>

Export coding.

<?php

require_once __DIR__ . '/vendor/autoload.php';

if ((isset($_POST['editor'])) && (!empty($_POST['editor']))) {

    $pdfcontent = $_POST['editor'];

    $mpdf = new \Mpdf\Mpdf();
    
    $mpdf->WriteHTML($pdfcontent);

    // $mpdf->SetDisplayMode('fullpage');
    // $mpdf->list_indent_first_level = 0;

    //output in browser
    $mpdf->Output('mypdf.pdf', 'D');

}

?>

Answer 1

You have to give each textarea another name, so each one gets included when you submit the form. One way of doing this is to use a counter:

<form method='post' action='thanks.php' enctype="multipart/form-data">
<?php

$areaCount = 1;

while ($rows = mysqli_fetch_assoc($result)) {

    echo '<textarea name="editor_' . $areaCount . '" id="editor">'.
         $rows['Content'] . '</textarea><br>';

    $areaCount++;

}

?>

<input type="submit" name="export" value="Export" id="export" class="btn third">
</form>

Now when the form is submitted you have to find all the areas again:

<?php

require_once __DIR__ . '/vendor/autoload.php';

if (isset($_POST['export'])) {

    $pdfcontent = '';
    $areaCount  = 1;

    while (isset($_POST['editor_' . $areaCount])) { 

        $pdfcontent .= $_POST['editor_' . $areaCount];
        $areaCount++;

    }

    $mpdf = new \Mpdf\Mpdf();
    
    $mpdf->WriteHTML($pdfcontent);

    // $mpdf->SetDisplayMode('fullpage');
    // $mpdf->list_indent_first_level = 0;

    //output in browser
    $mpdf->Output('mypdf.pdf', 'D');

}

?>