This method supports retrieving both child modules and grand child modules.
public getModule ( string $id, boolean $load = true ) : |
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$id | string | module ID (case-sensitive). To retrieve grand child modules, use ID path relative to this module (e.g. `admin/content`). |
$load | boolean | whether to load the module if it is not yet loaded. |
return | the module instance, `null` if the module does not exist. |