get_post_type_labels()

function get_post_type_labels( $post_type_object ) {
	$nohier_vs_hier_defaults = array(
		'name'                     => array( _x( 'Posts', 'post type general name' ), _x( 'Pages', 'post type general name' ) ),
		'singular_name'            => array( _x( 'Post', 'post type singular name' ), _x( 'Page', 'post type singular name' ) ),
		'add_new'                  => array( _x( 'Add New', 'post' ), _x( 'Add New', 'page' ) ),
		'add_new_item'             => array( __( 'Add New Post' ), __( 'Add New Page' ) ),
		'edit_item'                => array( __( 'Edit Post' ), __( 'Edit Page' ) ),
		'new_item'                 => array( __( 'New Post' ), __( 'New Page' ) ),
		'view_item'                => array( __( 'View Post' ), __( 'View Page' ) ),
		'view_items'               => array( __( 'View Posts' ), __( 'View Pages' ) ),
		'search_items'             => array( __( 'Search Posts' ), __( 'Search Pages' ) ),
		'not_found'                => array( __( 'No posts found.' ), __( 'No pages found.' ) ),
		'not_found_in_trash'       => array( __( 'No posts found in Trash.' ), __( 'No pages found in Trash.' ) ),
		'parent_item_colon'        => array( null, __( 'Parent Page:' ) ),
		'all_items'                => array( __( 'All Posts' ), __( 'All Pages' ) ),
		'archives'                 => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
		'attributes'               => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
		'insert_into_item'         => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
		'uploaded_to_this_item'    => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
		'featured_image'           => array( _x( 'Featured image', 'post' ), _x( 'Featured image', 'page' ) ),
		'set_featured_image'       => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
		'remove_featured_image'    => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
		'use_featured_image'       => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
		'filter_items_list'        => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
		'filter_by_date'           => array( __( 'Filter by date' ), __( 'Filter by date' ) ),
		'items_list_navigation'    => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
		'items_list'               => array( __( 'Posts list' ), __( 'Pages list' ) ),
		'item_published'           => array( __( 'Post published.' ), __( 'Page published.' ) ),
		'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
		'item_reverted_to_draft'   => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
		'item_scheduled'           => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
		'item_updated'             => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
		'item_link'                => array(
			_x( 'Post Link', 'navigation link block title' ),
			_x( 'Page Link', 'navigation link block title' ),
		),
		'item_link_description'    => array(
			_x( 'A link to a post.', 'navigation link block description' ),
			_x( 'A link to a page.', 'navigation link block description' ),
		),
	);

	$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];

	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );

	$post_type = $post_type_object->name;

	$default_labels = clone $labels;

	/**
	 * Filters the labels of a specific post type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to
	 * the post type slug.
	 *
	 * Possible hook names include:
	 *
	 *  - `post_type_labels_post`
	 *  - `post_type_labels_page`
	 *  - `post_type_labels_attachment`
	 *
	 * @since 3.5.0
	 *
	 * @see get_post_type_labels() for the full list of labels.
	 *
	 * @param object $labels Object with labels for the post type as member variables.
	 */
	$labels = apply_filters( "post_type_labels_{$post_type}", $labels );

	// Ensure that the filtered labels contain all required default values.
	$labels = (object) array_merge( (array) $default_labels, (array) $labels );

	return $labels;
}