Forms and PHP

Hello, I am creating a website. The web design is doing ok and I have created
the home page. My website is a small business uniquely for teenagers. It will
allow them to submit their school papers so I and perhaps some of my associates
can proofread and correct them. I am having some major organizational problems
with the Submit Paper page, in where they submit and pay for my services. I
would like people to enter/copy the document into a field submit box, which
will be limited to 8,000 words or less, and their email. Then I would like to
have a PHP function in where it calculates the number of words submitted and
gives a price on a different page. Afterwards, they either choose to pay
through Paypal or they cancel it. If they cancel, the document is not sent to
my email, and if it is then they pay and the document and money is sent. I
will charge a specific amount for a certain amount of words and therefore I
need a PHP function in where the number of words are calculated and refusal if
it exceeds a certain amount of words. I would appreciate if someone could
help me figure out how to set me up. I do not want any html code or complicated
technical PHP, I would just like consulting on how I would do this and maybe
some of my options. ANyone have any ideas? Thanks, Mike

Ok, but my response will be charged according to the number of words - are
these terms acceptable?

Mikawagoo <webforumsuser (AT) macromedia (DOT) com> wrote in
news:cm5qbr$d04$1 (AT) forums (DOT) macromedia.com:

I will charge a specific amount for a certain amount
of words and therefore I need a PHP function in where the number of
words are calculated and refusal if it exceeds a certain amount of
words.

http://php.net/str_word_count