Counting the amount of words in a string?

[craigbabe]

All I can find is how many characters there is but I want words. Do you know how i can do this?
Happy Easter btw

[toplay]

PHP 4.3.0+ example:

[code]
$msg = "Hello world!";

echo str_word_count($msg); // displays 2
[/code]
[a href=\"http://us2.php.net/manual/en/function.str-word-count.php\" target=\"_blank\"]http://us2.php.net/manual/en/function.str-word-count.php[/a]