how to calculate frequency of words in array?

From: Date: Fri, 08 Mar 2002 14:45:03 +0000
Subject: how to calculate frequency of words in array?
Groups: php.general 
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Does anybody has a clever way to summarize the number of different words (with multiple occurences) from an array into an array with all the different words and the times they occured? Thanks a lot! Simon

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