Getting key of value added to array with []?

From: Date: Tue, 04 Feb 2003 11:43:15 +0000
Subject: Getting key of value added to array with []?
Groups: php.general 
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Is there any way to get the key of an element added to an array with []? I need to use this for a reference to it. The only idea I can think of is to foreach through the array and use the last key looped through, but that seems very dirty.

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