WP: Register New Sidebar

register_new_sidebar.php

<?php
/**
 * Location: functions.php
 */

// callback function
function your_widget_display() {
    // print some HTML for the widget to display here
    echo "Your Widget Test";
}

// registering the sidebar widget
wp_register_sidebar_widget(
    'your_widget_1',        // your unique widget id
    'Your Widget',          // widget name
    'your_widget_display',  // callback function
    array(                  // options
        'description' => 'Description of what your widget does'
    )
);