How To Add Custom Fields for Comment Form in WordPress

We need to add more fields for the comment form. we are adding for “phone number” field. this code for creating a text box for the comment form.

1. Add field for comment form.

add_filter('comment_form_default_fields', 'custom_fields');
function custom_fields($fields) {

    $commenter = wp_get_current_commenter();
    $req = get_option( 'require_name_email' );
    $aria_req = ( $req ? " aria-required='true'" : ’ );

    $fields[ 'phone' ] = '<p class="comment-form-phone">'.
      '<label for="phone">' . __( 'Phone' ) . '</label>'.
      '<input id="phone" name="phone" type="text" size="30"  tabindex="4" /></p>';

  return $fields;
}

2.  Save the comment meta data along with comment.

add_action( 'comment_post', 'save_comment_meta_data' );
function save_comment_meta_data( $comment_id ) {
  if ( ( isset( $_POST['phone'] ) ) && ( $_POST['phone'] != ’) )
  $phone = wp_filter_nohtml_kses($_POST['phone']);
  add_comment_meta( $comment_id, 'phone', $phone );
}

3 Add an edit option to comment editing screen in admin panel

add_action( 'add_meta_boxes_comment', 'extend_comment_add_meta_box' );
function extend_comment_add_meta_box() {
    add_meta_box( 'title', __( 'Comment Metadata - Extend Comment' ), 'extend_comment_meta_box', 'comment', 'normal', 'high' );
}

function extend_comment_meta_box ( $comment ) {
    $phone = get_comment_meta( $comment->comment_ID, 'phone', true );
    $title = get_comment_meta( $comment->comment_ID, 'title', true );
    $rating = get_comment_meta( $comment->comment_ID, 'rating', true );
    wp_nonce_field( 'extend_comment_update', 'extend_comment_update', false );
    ?>
    <p>
        <label for="phone"><?php _e( 'Phone' ); ?></label>
        <input type="text" name="phone" value="<?php echo esc_attr( $phone ); ?>" class="widefat" />
    </p>
    <?php
}

5. Update comment meta data from comment editing screen  in admin panel

add_action( 'edit_comment', 'extend_comment_edit_metafields' );


function extend_comment_edit_metafields( $comment_id ) {
    if( ! isset( $_POST['extend_comment_update'] ) || ! wp_verify_nonce( $_POST['extend_comment_update'], 'extend_comment_update' ) ) return;

  if ( ( isset( $_POST['phone'] ) ) && ( $_POST['phone'] != ’) ) :
  $phone = wp_filter_nohtml_kses($_POST['phone']);
  update_comment_meta( $comment_id, 'phone', $phone );
  else :
  delete_comment_meta( $comment_id, 'phone');
  endif;

}