udm_cat_path() returns array
describing path in the categories tree from the tree root to
the current category.
agent - agent link
identifier.
category - current
category - the one to get path to.
Returns array with the following format:
The array consists of pairs. Elements with even index
numbers contain category paths, odd elements contain
corresponding category names.
For example, the call
$array=udm_cat_path($agent, '02031D'); may return the
following array:
$array[0] will contain ''
$array[1] will contain 'Root'
$array[2] will contain '02'
$array[3] will contain 'Sport'
$array[4] will contain '0203'
$array[5] will contain 'Auto'
$array[4] will contain '02031D'
$array[5] will contain 'Ferrari'