WordPress at a glance
function is not described

Walker::start_lvl() public WP 2.1.0

Starts the list before the elements are added.

The $args parameter holds additional values that may be used with the child class methods. This method is called at the start of the output list.

{} It's a method of the class: Walker{}

No Hooks.

Return

null. Nothing.

Usage

$Walker = new Walker();
$Walker->start_lvl( $output, $depth, $args );
$output(string) (required) (passed by reference — &)
Used to append additional content (passed by reference).
$depth(int)
Depth of the item.
$args(array)
An array of additional arguments.

Changelog

Since 2.1.0 Introduced.

Code of Walker::start_lvl() WP 5.7.2

<?php
public function start_lvl( &$output, $depth = 0, $args = array() ) {}