view/form.php
<?php
$actionUrl = $this->url("comment/$postid/$method");
?>
<form method="post" action="<?= $actionUrl ?>">
<?php if (isset($comment) && $comment->id) : ?>
<?= $form->input('id', 'hidden') ?>
<?= $form->input('parent_id', 'hidden') ?>
<?php else : ?>
<input type="hidden" name="parent_id" value="<?= $parent_id ?>">
<?php endif; ?>
<input type="hidden" name="post_id" value="<?= $postid ?>">
<?= $form->textarea("content", ['rows' => '6', 'cols' => '60', 'required' => true]) ?>
<?php if ($form->hasError('content')) : ?>
<div class="form-error"><?= $form->getError('content') ?></div>
<?php endif; ?>
<br>
<input type="submit" value="<?= $submit ?>">
</form>