[wp-hackers] add_action for XML-RPC

[Sean Hickey]

I already tried using it like this:

add_filter('xmlrpc_methods', array('myplug.ping' => 'myplug_ping'));
function myplug_ping($args) {
	return $args;
}

And it didn't do anything.  The only place that "xmlrpc_methods" is
even mentioned in the docs is under Skippy's page, and there it's only
listed, no description.

Even if that did work, and I'm doing something wrong, it seems the
filter is important/nice enough to get mentioned in the codex, along
with a proper description for using it.

- Sean
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