add_action( 'init', 'dwwp_register_post_type' );

function dwwp_register_post_type() {

     $singular = 'Case Study';
     $plural = 'Case Studies';
     $slug = str_replace( ' ', '-', strtolower( $singular ) );
     $labels = array(
          'name'              => $plural,
          'singular_name'     => $singular,
          'add_new'           => 'Add New',
          'add_new_item'      => 'Add New ' . $singular,
          'edit'                 => 'Edit',
          'edit_item'            => 'Edit ' . $singular,
          'new_item'             => 'New ' . $singular,
          'view'              => 'View ' . $singular,
          'view_item'         => 'View ' . $singular,
          'search_term'       => 'Search ' . $plural,
          'parent'       => 'Parent ' . $singular,
          'not_found'         => 'No ' . $plural .' found',
          'not_found_in_trash'     => 'No ' . $plural .' in Trash'
          );
     $args = array(
             'labels'              => $labels,
             'public'              => true,
             'publicly_queryable'  => true,
             'exclude_from_search' => false,
             'show_in_nav_menus'   => true,
             'show_ui'             => true,
             'show_in_menu'        => true,
             'show_in_admin_bar'   => true,
             'menu_position'       => 10,
             'menu_icon'           => 'dashicons-location',
             'can_export'          => true,
             'delete_with_user'    => false,
             'hierarchical'        => false,
             'has_archive'         => true,
             'query_var'           => true,
             'capability_type'     => 'post',
             'map_meta_cap'        => true,
             // 'capabilities' => array(),
             'rewrite'             => array(
               'slug' => $slug,
               'with_front' => true,
               'pages' => true,
               'feeds' => true,
             ),
             'supports' => array(
               'title',
               'thumbnail',
               'revisions'
             ),
             'taxonomies' => array('post_tag'),
     );
     register_post_type( $slug, $args);
     // flush_rewrite_rules();
}