bp_core_new_nav_item( array|string $args, string $component = 'members' )

function bp_core_new_nav_item( $args, $component = 'members' ) {
	if ( ! bp_is_active( $component ) ) {
		return;
	}

	$defaults = array(
		'name'                    => false, // Display name for the nav item.
		'slug'                    => false, // URL slug for the nav item.
		'item_css_id'             => false, // The CSS ID to apply to the HTML of the nav item.
		'show_for_displayed_user' => true,  // When viewing another user does this nav item show up?
		'site_admin_only'         => false, // Can only site admins see this nav item?
		'position'                => 99,    // Index of where this nav item should be positioned.
		'screen_function'         => false, // The name of the function to run when clicked.
		'default_subnav_slug'     => false  // The slug of the default subnav item to select when clicked.
	);

	$r = wp_parse_args( $args, $defaults );

	// Validate nav link data.
	$nav_item = bp_core_create_nav_link( $r, $component );

	/*
	 * To mimic legacy behavior, if bp_core_create_nav_link() returns false, we make
	 * an early exit and don't attempt to register the screen function.
	 */
	if ( false === $nav_item ) {
		return false;
	}

	// Then, hook the screen function for the added nav item.
	$hooked = bp_core_register_nav_screen_function( $nav_item );
	if ( false === $hooked ){
		return false;
	}

	/**
	 * Fires after adding an item to the main BuddyPress navigation array.
	 * Note that, when possible, the more specific action hooks
	 * `bp_core_create_nav_link` or `bp_core_register_nav_screen_function`
	 * should be used.
	 *
	 * @since BuddyPress 1.5.0
	 *
	 * @param array $r        Parsed arguments for the nav item.
	 * @param array $args     Originally passed in arguments for the nav item.
	 * @param array $defaults Default arguments for a nav item.
	 */
	do_action( 'bp_core_new_nav_item', $r, $args, $defaults );
}