uninstall.php

<?php
/**
 * UserRegistration Uninstall
 *
 * Uninstalls the plugin and associated data.
 *
 * @package  UserRegistration/Uninstaller
 * @version  1.0.0
 */

defined( 'WP_UNINSTALL_PLUGIN' ) || exit;

global $wpdb;

/*
 * Only remove ALL product and page data if UR_REMOVE_ALL_DATA constant is set to true in user's
 * wp-config.php. This is to prevent data loss when deleting the plugin from the backend
 * and to ensure only the site owner can perform this action.
 */

$uninstall_option = get_option( 'user_registration_general_setting_uninstall_option', false );

if ( defined( 'UR_REMOVE_ALL_DATA' ) && true === UR_REMOVE_ALL_DATA || 'yes' == $uninstall_option || true == $uninstall_option  ) {
	include_once dirname( __FILE__ ) . '/includes/class-ur-install.php';

	// Roles + caps.
	UR_Install::remove_roles();

	// Pages.
	wp_trash_post( get_option( 'user_registration_myaccount_page_id' ) );
	wp_trash_post( get_option( 'user_registration_default_form_page_id' ) );

	// Tables.
	UR_Install::drop_tables();

	// Delete options.
	$wpdb->query( "DELETE FROM $wpdb->options WHERE option_name LIKE 'user_registration\_%';" );
	$wpdb->query( "DELETE FROM $wpdb->options WHERE option_name LIKE 'ur\_%';" );
	$wpdb->query( "DELETE FROM $wpdb->options WHERE option_name LIKE 'urmc\_%';" );

	// Delete usermeta.
	$wpdb->query( "DELETE FROM $wpdb->usermeta WHERE meta_key LIKE 'user_registration\_%';" );

	// Delete form id and confirm key.
	$wpdb->query( "DELETE FROM $wpdb->usermeta WHERE meta_key IN ( 'ur_form_id', 'ur_confirm_email', 'ur_confirm_email_token' ) " );

	$args      = array(
		'order'         => 'ASC',
		'numberposts'   => -1,
		'status'        => 'publish',
		'post_type'     => 'user_registration',
		'orderby'       => 'ID',
		'order'         => 'DESC',
		'no_found_rows' => true,
		'nopaging'      => true,
	);
	$all_forms = get_posts( $args );

	foreach ( $all_forms as $form ) {
		$result   = wp_delete_post( $form->ID );
		$del_meta = $wpdb->delete( $wpdb->postmeta, array( 'post_id' => $form->ID ) );
	}

	// Clear any cached data that has been removed.
	wp_cache_flush();
}