uninstall.php

<?php
/**
 * Uninstall handler: removes all plugin options and transients.
 *
 * WordPress calls this file directly (not through the normal plugin
 * bootstrap) when the plugin is deleted from the Plugins screen.
 *
 * @package IPDataInfo
 */

// If uninstall is not called from WordPress, bail.
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit;
}

/**
 * Delete the plugin's settings option.
 */
delete_option( 'ipdatainfo_settings' );
delete_site_option( 'ipdatainfo_settings' );

/**
 * Delete every cached per-IP lookup transient created by the plugin.
 *
 * Transients are stored with keys like `ipdatainfo_<md5>` (and their
 * paired `_transient_timeout_` rows), so a direct `$wpdb` query is the
 * only practical way to clean them all up without knowing every IP hash.
 */
global $wpdb;

// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- required for a full bulk cleanup on uninstall.
$wpdb->query(
	$wpdb->prepare(
		"DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
		$wpdb->esc_like( '_transient_ipdatainfo_' ) . '%',
		$wpdb->esc_like( '_transient_timeout_ipdatainfo_' ) . '%'
	)
);
// phpcs:enable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching