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Gets all of the child resource ids for a given resource.
API Doc: modX::getChildIds()
array getChildIds ([integer $id = null], [integer $depth = 10], [array $options = array()])
Get all the children IDs for the Resource 23. Limit to 6 levels deep. Only in the web context.
$array_ids = $modx->getChildIds(23,6,array('context' => 'web'));
Note that when using this method in the manager (to collect input options for a TV for example), you need to define the context with the third
options parameter as it defaults to the current context (in that scenario the manager).