Gazelle/sections/tools/managers/mass_pm.php

<?php
#declare(strict_types = 1);

if (!check_perms("users_mod")) {
    error(403);
}

$Classes = Users::get_classes()[0];
// If your user base is large, sending a PM to the lower classes will take a long time
// add the class ID into this array to skip it when presenting the list of classes
$SkipClassIDs = array(USER, MEMBER, POWER, ELITE, TORRENT_MASTER, DONOR, POWER_TM, ELITE_TM);

View::show_header(
    'Compose Mass PM',
    'inbox,bbcode,vendor/jquery.validate.min,form_validate'
); ?>

<main>
  <div class="header">
    <h2>Send a mass PM</h2>
  </div>
  <form class="send_form" name="message" action="tools.php" method="post" id="messageform">
    <div class="box pad">
      <input type="hidden" name="action" value="take_mass_pm" />
      <input type="hidden" name="auth"
        value="<?=G::$LoggedUser['AuthKey']?>" />
      <div id="quickpost">
        <h3>Class</h3>
        <select id="class_id" name="class_id">
          <option>---</option>
          <?php foreach ($Classes as $Class) {
    if (!in_array($Class['ID'], $SkipClassIDs)) { ?>
          <option value="<?=$Class['ID']?>">
            <?=$Class['Name']?>
          </option>
          <?php }
} ?>
        </select>
        <h3>Subject</h3>
        <input type="text" class="required" name="subject" size="95" /><br />
        <h3>Body</h3>
        <textarea id="body" class="required" name="body" cols="95" rows="10" onkeyup="resize('body')"></textarea>
      </div>
      <input type="checkbox" name="from_system" id="from_system" />Send as System
      <div id="preview" class="hidden"></div>
      <div id="buttons" class="center">
        <input type="button" value="Preview" onclick="Quick_Preview();" />
        <input type="submit" value="Send message" />
      </div>
    </div>
  </form>
</main>
<?php View::show_footer();