You will need to:
Distinguish the file type
$file_name = $_FILES['image']['name']; $file_extn = end(explode(".", strtolower($_FILES['image']['name']))); if($file_extn == "doc" || $file_extn == "docx"){ docx2text(); }elseif($file_extn == "rtf"){ rtf2text(); }
Convert the document to text
https://stackoverflow.com/a/7371315/2512934 for doc or docx http://webcheatsheet.com/php/reading_the_clean_text_from_rtf.php for rtf
Count the words http://php.net/manual/en/function.str-word-count.php