Piwik::custom(string $method[, array $arguments, boolean/integer $id, boolean $period, string $format]);
$method
- the method you want to use to query the Piwik API (See here for more Info).
$arguments
- an array of the extra arguments you want to add to the query URL.
$id
- either a boolean value, 'true' displaying the site ID as declared in config, and also you can enter custom Site IDs.
$period
- toggle whether you want the period & date in the query URL.
$format
- A format other than the default one declared in config
Piwik::custom('SitesManager.getSitesIdFromSiteUrl', array('url'=>'http://example.com'), false, false, 'json');
will return something like the following Array:
Array ( [0] => stdClass Object ( [idsite] => 1 ) )