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Gets all of the parent resource ids for a given resource.
API Doc: modX::getParentIds()
array getParentIds ([integer $id = null], [integer $height = 10], [array $options = array()] )
Get all of the parent IDs for the Resource with ID 23.
$parentIds = $modx->getParentIds(23);
Important! This method makes use of the context cache to get the parent IDs. If you don't specify the context in the options (third) parameter it will use the current context. In a plugin or external application that is often "mgr". When this method returns an empty array, it is most likely looking in the wrong context so you will have to specify the third parameter. Example:
$pids = $modx->getParentIds($id, 10, array('context' => 'web'));