$v ) { $data[ $k ]['data_id'] = $k; } return $data; } } add_filter( 'cf7d_admin_fields', 'filter_cf7d_admin_fields', 10, 2 ); if ( ! function_exists( 'filter_cf7d_admin_fields' ) ) { function filter_cf7d_admin_fields( $fields, $fid ) { return array( 'data_id' => 'ID' ) + $fields; } }