taxonomy registration for CPT

class.register-taxonomy.php

<?php

namespace Example\Register\Taxonomy;

class Profile_Tag {

    static $taxonomy_name;

    /**
     *  Initialize Profile_Tag class
     */
    function __construct() {
        self::$taxonomy_name = 'profile-tag';
        self::register_hooks();
    }

    /**
     *  Load action hooks & filters
     */
    private function register_hooks() {

        add_action( 'example/routine/register/taxonomies', array(__CLASS__, 'register_taxonomy' ));
    }

    /**
     *	Register Taxonomy
     */
    public static function register_taxonomy() {

        /* Register Profile Tags Taxonomy */
        $labels = array(
            'name'						=> __( 'Tags', 'example' ),
            'singular_name'				=> __( 'Profile Tag', 'example' ),
            'search_items'				=> __( 'Search Profile Tags' , 'example' ),
            'popular_items'				=> __( 'Popular Profile Tags' , 'example'),
            'all_items'					=> __( 'All Profile Tags' , 'example' ),
            'parent_item'				=> null,
            'parent_item_colon'			=> null,
            'edit_item'					=> __( 'Edit Profile Tag' , 'example' ),
            'update_item'				=> __( 'Update Profile Tag' , 'example' ),
            'add_new_item'				=> __( 'Add New Profile Tag' , 'example' ),
            'new_item_name'				=> __( 'New Profile Tag' , 'example' ),
            'separate_items_with_commas'=> __( 'Separate Profile Tags with commas' , 'example' ),
            'add_or_remove_items'		=> __( 'Add or remove Profile Tags' , 'example'),
            'choose_from_most_used'		=> __( 'Choose from the most used profile tags', 'example' ),
            'not_found'					=> __( 'No profile tags found.' , 'example'),
            'menu_name'					=> __( '+Tags', 'example' ),
        );

        $args = array(
            'hierarchical'			=> false,
            'labels'				=> $labels,
            'show_ui'				=> true,
            'show_admin_column'		=> true,
            'show_in_menus'			=> false,
            'show_in_nav_menus'		=> false,
            'update_count_callback' => '_update_post_term_count',
            'query_var'				=> true,
            'rewrite'				=> false
        );

        register_taxonomy( self::$taxonomy_name , 'example-profile', $args );
    }

}

new Profile_Tag;