network_edit_site_nav( $args = array() )

function network_edit_site_nav( $args = array() ) {

	/**
	 * Filters the links that appear on site-editing network pages.
	 *
	 * Default links: 'site-info', 'site-users', 'site-themes', and 'site-settings'.
	 *
	 * @since WP-4.6.0
	 *
	 * @param array $links {
	 *     An array of link data representing individual network admin pages.
	 *
	 *     @type array $link_slug {
	 *         An array of information about the individual link to a page.
	 *
	 *         $type string $label Label to use for the link.
	 *         $type string $url   URL, relative to `network_admin_url()` to use for the link.
	 *         $type string $cap   Capability required to see the link.
	 *     }
	 * }
	 */
	$links = apply_filters( 'network_edit_site_nav_links', array(
		'site-info'     => array( 'label' => __( 'Info' ),     'url' => 'site-info.php',     'cap' => 'manage_sites' ),
		'site-users'    => array( 'label' => __( 'Users' ),    'url' => 'site-users.php',    'cap' => 'manage_sites' ),
		'site-themes'   => array( 'label' => __( 'Themes' ),   'url' => 'site-themes.php',   'cap' => 'manage_sites' ),
		'site-settings' => array( 'label' => __( 'Settings' ), 'url' => 'site-settings.php', 'cap' => 'manage_sites' )
	) );

	// Parse arguments
	$r = wp_parse_args( $args, array(
		'blog_id'  => isset( $_GET['blog_id'] ) ? (int) $_GET['blog_id'] : 0,
		'links'    => $links,
		'selected' => 'site-info',
	) );

	// Setup the links array
	$screen_links = array();

	// Loop through tabs
	foreach ( $r['links'] as $link_id => $link ) {

		// Skip link if user can't access
		if ( ! current_user_can( $link['cap'], $r['blog_id'] ) ) {
			continue;
		}

		// Link classes
		$classes = array( 'nav-tab' );

		// Selected is set by the parent OR assumed by the $pagenow global
		if ( $r['selected'] === $link_id || $link['url'] === $GLOBALS['pagenow'] ) {
			$classes[] = 'nav-tab-active';
		}

		// Escape each class
		$esc_classes = implode( ' ', $classes );

		// Get the URL for this link
		$url = add_query_arg( array( 'id' => $r['blog_id'] ), network_admin_url( $link['url'] ) );

		// Add link to nav links
		$screen_links[ $link_id ] = '<a href="' . esc_url( $url ) . '" id="' . esc_attr( $link_id ) . '" class="' . $esc_classes . '">' . esc_html( $link['label'] ) . '</a>';
	}

	// All done!
	echo '<h2 class="nav-tab-wrapper wp-clearfix">';
	echo implode( '', $screen_links );
	echo '</h2>';
}