Hacer opcionales el nombre y email en los comentarios, y ocultar la URL

    De esta forma facilitamos a nuestros visitantes la publicación de comentarios y guardaremos menos datos privados.

    <?php
    function wpb_alter_comment_form_fields($fields) {
     
    // Modify Name Field and show that it's Optional 
    $fields['author'] = '<p class="comment-form-author">' . '<label for="author">' . __( 'Name (Optional)' ) . '</label> ' . ( $req ? '<span class="required">*</span>' : '' ) .
    '<input id="author" name="author" type="text" value="' . esc_attr( $commenter['comment_author'] ) . '" size="30"' . $aria_req . ' /></p>';
     
    // Modify Email Field and show that it's Optional
    $fields['email'] = '<p class="comment-form-email"><label for="email">' . __( 'Email (Optional)', 'twentythirteen' ) . '</label> ' .
          ( $req ? '<span class="required">*</span>' : '' ) .
          '<input id="email" name="email" type="text" value="' . esc_attr(  $commenter['comment_author_email'] ) .
          '" size="30"' . $aria_req . ' /></p>'; 
     
    // This line removes the website URL from comment form.       
          $fields['url'] = '';
     
        return $fields;
    }
    add_filter('comment_form_default_fields', 'wpb_alter_comment_form_fields');