<?php

	//if uninstall not called from WordPress exit
	if ( !defined( 'WP_UNINSTALL_PLUGIN' ) ) 
	    exit();

	global $wpdb;
	$option_names = array();
	$wp_options = $wpdb->get_results("
					SELECT option_name
					FROM $wpdb->options
					WHERE option_name LIKE '%%addmultipleuser%%'
					");
	foreach ( $wp_options as $wp_option ) {
		$option_names[] = $wp_option->option_name;
	}

	// For Single site
	if ( !is_multisite() ) {
		foreach( $option_names as $option_name ) {
		    delete_option( $option_name );
		}
	} else {
	// For Multisite
	    // For regular options.
	    $blog_ids = $wpdb->get_col( "SELECT blog_id FROM $wpdb->blogs" );
	    $original_blog_id = get_current_blog_id();
	    foreach ( $blog_ids as $blog_id ) {
	        switch_to_blog( $blog_id );
			foreach( $option_names as $option_name ) {
			    delete_option( $option_name );
			}
	    }
	    switch_to_blog( $original_blog_id );

	    // For site options.
		foreach( $option_names as $option_name ) {
		    delete_site_option( $option_name );  
		}
	}

?>