getting keys of multidim. array

Hi, I'm looking for a way to get the keys of arrays like this: $MENU["news"]["item1"]["Title"]=... $MENU["news"]["item2"]["Title"]=... $MENU["news"]["item3"]["Title"]=... $MENU["news"]["item4"]["Title"]=... I want to create an array (on the fly): $Menu_Keys=[ "item1", "item2", "item3",...] How can i accomplish this? Bernhard Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such a case, you should destroy this message and kindly notify the sender by reply e-mail.