Create a Taxonomy for Custom Post Event

gistfile1.txt

/**
 * Create a Taxonomy for Custom Post Event
 * Paste this code in Theme function.php
 */

add_action('init', 'create_event_taxonomy', 0);
if ( ! function_exists('create_event_taxonomy')) {
    function create_event_taxonomy()
    {
        register_taxonomy(
            'event_category',
            'event',
            array(
                'labels' => array(
                    'name' => 'Event Category',
                    'add_new_item' => 'Add New Event Category',
                    'new_item_name' => "New Event Category"
                ),
                'show_ui' => true,
                'show_tagcloud' => false,
                'hierarchical' => true
            )
        );
    }
}