<select class="selectpicker col-md-12 p-l-0 p-r-0" data-style="form-control btn-secondary" name="kat_id" required >
  <option value="">Yükleyici Firmalar</option>
  <?php foreach ($katCek as $kat) {
    if (!empty($kat['yukleyici'])) { ?>
      <option value="<?=$kat['id']?>"><?=$kat['yukleyici']?></option>
    <?php }
  }?>
</select>