uninstall.php

<?php

if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) || ! WP_UNINSTALL_PLUGIN || dirname( WP_UNINSTALL_PLUGIN ) != dirname( plugin_basename( __FILE__ ) ) ) {
	status_header( 404 );
	exit;
}

// Delete SAP CDC admin settings options.
delete_option( GIGYA__SETTINGS_GLOBAL );
delete_option( GIGYA__SETTINGS_LOGIN );
delete_option( GIGYA__SETTINGS_SCREENSETS );
delete_option( GIGYA__SETTINGS_SESSION );
delete_option( GIGYA__SETTINGS_SHARE );
delete_option( GIGYA__SETTINGS_COMMENTS );
delete_option( GIGYA__SETTINGS_REACTIONS );
delete_option( GIGYA__SETTINGS_GM );

// Delete SAP CDC widgets options.
delete_option( 'widget_gigya_share' );
delete_option( 'widget_gigya_comments' );
delete_option( 'widget_gigya_reactions' );
delete_option( 'widget_gigya_gamification' );
delete_option( 'widget_gigya_feed' ); /* Deprecated/Removed */
delete_option( 'widget_gigya_follow' ); /* Deprecated/Removed */

// Remove custom SAP CDC capabilities
$role = get_role('administrator');
$role->remove_cap('edit_gigya');
$role->remove_cap('edit_gigya_secret');

// Remove old widgets if still there.
global $wpdb;
$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->wp_options WHERE option_name LIKE '%widget_gigya%'" ) );