Counting the occurences of items in an array

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Has this wheel been invented, but simpler? I've an array of words that
I'd like to know how many occurences of each there are. For instance:
$fruits = array(
   "lemon",
   "orange",
   "banana",
   "apple",
   "orange",
   "banana",
   "orange"    );

And I'd like to create this:
$fruit_count = array(
   "lemon" => 1,
   "orange" => 3,
   "banana" => 2,
   "apple" => 1    );

My current plan of action is to create $fruit_count, and check if
$fruits[0] is listed in it. If not, then I'll add it with a value of
1. If it is already listed then I'll just increase it's number. Ditto
for $fruits[1] and so on...

Has someone cleverer than myself found a better way of doing this?
This function will be used as a word count for text documents, and
some of them have over 5000 words. So if there's a better way of doing
this I'd love to know. Thanks.

Dotan Cohen

http://what-is-what.com/what_is/html_email.html
http://lyricslist.com/lyrics/artist_albums/162/disturbed.php

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