adminhtml - Get id of deleted category [Magento] -

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how id of deleted category observer?

config.xml markup

<adminhtml>     <events>         <catalog_category_delete_after>             <observers>                 <my_module>                     <type>singleton</type>                     <class>my_module/observer</class>                     <method>oncategorydeleteafter</method>                 </my_module>             </observers>         </catalog_category_delete_after>     </events> </adminhtml>

observer code like:

class my_module_model_observer {     public function oncategorydeleteafter() {             #do deleted category id     } }

use passed $observer variable.

class my_module_model_observer {     public function oncategorydeleteafter($observer) {         $observer->getevent()->getcategory();     } }

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