<?php defined( 'ABSPATH' ) or exit; $section_widgets = get_option( 'sidebars_widgets', array() ); $replaced = false; foreach ( $section_widgets as $section => $widgets ) { // WP has an "array_version" key that is not an array... if ( ! is_array( $widgets ) ) { continue; } // loop through widget ID's foreach ( $widgets as $key => $widget_id ) { // does this widget ID start with "mc4wp_widget"? if ( strpos( $widget_id, 'mc4wp_widget' ) === 0 ) { // replace "mc4wp_widget" with "mc4wp_form_widget" $new_widget_id = str_replace( 'mc4wp_widget', 'mc4wp_form_widget', $widget_id ); $section_widgets[ $section ][ $key ] = $new_widget_id; $replaced = true; } } } // update option if we made changes if ( $replaced ) { update_option( 'sidebars_widgets', $section_widgets ); } // update widget options $options = get_option( 'widget_mc4wp_widget', false ); if ( $options ) { update_option( 'widget_mc4wp_form_widget', $options ); // delete old option delete_option( 'widget_mc4wp_widget' ); }