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Get a site tree from a single or multiple modResource instances.
API Doc: modX::getTree()
array getTree ([int|array $id = null], [int $depth = 10], [array $options = array()])
$id(int|array) A single or multiple modResource ids to build the tree from.
$depth(integer) The maximum depth to build the tree (default 10).
$options(array) An array of filtering options, such as 'context' to specify the context to grab from.
Get a tree for the Resource with ID 12. Only go 5 levels deep.
$treeArray = $modx->getTree(12,5);