Description: ------------ PHP_compat, str_word_count.php, version 1.7 A bug in numbering keys when the $format = 2 $lastmatch is counted invalid, what may occur to wrong key numbering, if the next word in a string is a substring of previous Problem fix: There is foreach ($word_array as $word) { $word_assoc[$lastmatch = strpos($string, $word, $lastmatch)] = $word; } There should be: foreach ($word_array as $word) { $word_assoc[$lastmatch = strpos($string, $word, $lastmatch)] = $word; $lastmatch+=strlen($word); } Hope will be useful