Wanted to get rid of Paragrapgh tag in submit buttom of the WordPress form

Question

function modify_comment_form_fields($fields){
  // Check if $fields is an array
  if (!is_array($fields)) {
      return $fields;
  }

  ob_start();
  $submit_button = ob_get_clean();
  $submit_button .= '<input name="submit" type="submit" id="submit" class="submit" value="Post Comment">';
  // Check if $submit_button is a string
  if (!is_string($submit_button)) {
      return $fields;
  }

  $fields['submit_field'] = $submit_button;
  return $fields;
}
add_filter('comment_form_submit_field', 'modify_comment_form_fields');

The submit button is wrapped under the p tag inside a WordPress comment form.

I wanted to get rid of this → <p class="form-submit"></p>

But the solution didn't work, Can someone help me to take this further in troubleshooting?

Currently, In browser the output of submit button is rendered as this one →

<p class="form-submit"><input name="submit" type="submit" id="submit" class="submit" value="Post Comment"> <input type="hidden" name="comment_post_ID" value="8" id="comment_post_ID">
<input type="hidden" name="comment_parent" id="comment_parent" value="0">
</p>

Update The comment form looks like this →

    $fields = array(
  'heading_tag' => '<h6>Leave an opinion</h6>',
  'comment_field' => '<textarea name="comment" id="comment" cols="30" rows="6" placeholder="Your opinion matters, but do not spam us!" required></textarea>',
  'author' => '<input type="text" name="author" placeholder="Enter Full Name" value="' . esc_attr( $commenter['comment_author'] ) . '" required>',
  'email'  => '<input type="text" name="email" placeholder="Enter Email ID" value="' . esc_attr( $commenter['comment_author_email'] ) . '" required>'
  
);

$comment_args = array(
  'title_reply'        => '',
  'fields'             => $fields,
  'comment_field'      => $fields['comment_field'],
  'class_submit'       => 'submit',
  'label_submit'       => 'Post Comment',
  'class_form'         => 'comform'
);


comment_form($comment_args);

Answer 1

If you control the theme the simplest way to fix this is passing the submit_field argument into comment_form():

comment_form(
    array(
        'submit_field' => '%1$s %2$s',
    )
);

Default: <p class="form-submit">%1$s %2$s</p>, where %1$s is the submit button markup and %2$s is the comment hidden fields.

which removes the <p> altogether. However it might be useful to wrap the button and hidden fields in a div instead, e.g. 'submit_field' => '<div class="form-submit">%1$s %2$s</div>'.

As above the problem with your code is you've got the filter input and output arguments wrong: comment_form_submit_field has inputs $submit_field (string), $args (array), and should return a string.