Description:
------------
---
From manual page: http://www.php.net/function.str-word-count#refsect1-function.str-word-count-parameters
---
$str = "Hello friend, you're
       looking good today!";

print_r(str_word_count($str, 2);

Thanks to the doc, "str_word_count" will return an associative array where the key is the numeric position of the word inside the string and the value is the actual word itself.

Yes, this function returns an associative array but the key is the numeric position of the First Letter of the word.