bp_core_admin_maybe_save_pages_settings()

function bp_core_admin_maybe_save_pages_settings() {

	if ( ! isset( $_GET['page'] ) || ! isset( $_POST['submit'] ) ) {
		return false;
	}

	if ( 'bp-pages' != $_GET['page'] ) {
		return false;
	}

	if ( ! check_admin_referer( 'bp-pages-options' ) ) {
		return false;
    };

	if ( isset( $_POST['bp_pages'] ) ) {
		$valid_pages = array_merge( bp_core_admin_get_directory_pages(), bp_core_admin_get_static_pages() );

		$new_directory_pages = array();
		foreach ( (array) $_POST['bp_pages'] as $key => $value ) {
			// Exclude the new_forums_page to set in $new_directory_pages array.
			if ( isset( $valid_pages[ $key ] ) && 'new_forums_page' !== $key ) {
				$new_directory_pages[ $key ] = (int) $value;
			}
		}
		bp_core_update_directory_page_ids( $new_directory_pages );

		// Save the forums page id into the _bbp_root_slug_custom_slug option and set the forum root slug to selected page slug.
		if ( bp_is_active( 'forums' ) ) {
			if ( isset( $_POST['bp_pages'] ) && '' === $_POST['bp_pages']['new_forums_page'] ) {
				bp_update_option('_bbp_root_slug_custom_slug', '' );
			} else {
				$slug = get_post_field( 'post_name', (int)$_POST['bp_pages']['new_forums_page'] );
				bp_update_option('_bbp_root_slug', $slug);
				bp_update_option('_bbp_root_slug_custom_slug', (int)$_POST['bp_pages']['new_forums_page'] );
			}
		}
	}

	bp_core_redirect( bp_get_admin_url( add_query_arg( array( 'page' => 'bp-pages', 'added' => 'true' ) , 'admin.php' ) ) );
}