Clear variable in PHP. Code example

 $labels = array(
            'name'              => esc_html_x( 'Brands', 'taxonomy general name', 'myplugin' ),
            'singular_name'     => esc_html_x( 'Brand', 'taxonomy singular name', 'myplugin' ),
            'search_items'      => esc_html__( 'Search Brands', 'myplugin' ),
            'all_items'         => esc_html__( 'All Brands', 'myplugin' ),
            'parent_item'       => esc_html__( 'Parent Brand', 'myplugin' ),
            'parent_item_colon' => esc_html__( 'Parent Brand:', 'myplugin' ),
            'edit_item'         => esc_html__( 'Edit Brand', 'myplugin' ),
            'update_item'       => esc_html__( 'Update Brand', 'myplugin' ),
            'add_new_item'      => esc_html__( 'Add New Brand', 'myplugin' ),
            'new_item_name'     => esc_html__( 'New Brand Name', 'myplugin' ),
            'menu_name'         => esc_html__( 'Brand', 'myplugin' ),
        );

//To clear a variable <em><strong>$labels</strong></em> use function <em>unset</em>

[php]
unset($labels)

[/php]