WordPress at a glance
function is not described

IXR_Server::listMethods() public WP 1.0

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

No Hooks.

Return

Null. Nothing.

Usage

$IXR_Server = new IXR_Server();
$IXR_Server->listMethods( $args );

Code of IXR_Server::listMethods() WP 5.5.1

<?php
function listMethods($args)
{
    // Returns a list of methods - uses array_reverse to ensure user defined
    // methods are listed before server defined methods
    return array_reverse(array_keys($this->callbacks));
}