Description:
------------
str_word_count() considers "-" single character as a word. Either the itens "--", "---", "----" ...

Reproduce code:
---------------
$words = str_word_count("aaa - bbb-bb -- -ccc ---", 2);
print_r($words);

Expected result:
----------------
Array
(
    [0] => aaa
    [6] => bbb-bb
    [16] => -ccc
)

Actual result:
--------------
Array
(
    [0] => aaa
    [4] => -
    [6] => bbb-bb
    [13] => --
    [16] => -ccc
    [21] => --
)