Things to start the lab with today: 

1) Go to http://www.cs.indiana.edu/classes/a202
2) Click on What's New?
3) Click on the link to the source code for the first program of yesterday:

   http://silo.cs.indiana.edu:8346/1008/one.phps

4) Copy the code and place it in ~/apache/htdocs/thu01.php
5) Check that the program is working. 

6) Click on the link to the source code for the second program of yesterday:

   http://silo.cs.indiana.edu:8346/1008/two.phps

7) Copy the code and place it in ~/apache/htdocs/thu02.php
8) Check that this program is working too. 

9) Question: What is different between the two? 
             (How do they not behave the same?)

Three answers: 

  a) the URLs are different (one has the state the other one doesn't)
  b) windows from the same browser share the state when sessions are used (same ID)
  c) reload makes them act differently

Access of a file on a web server

 a) if the file is Python script 

    http://                                     protocol 
    silo.cs.indiana.edu                         host 
    :8346                                       port number 
    /cgi-bin/            this is a convention   script alias (see httpd.conf) 
    lab6/whatever                               the name of the script

 b) if the file is an .html file

    http://                                     protocol 
    silo.cs.indiana.edu                         host 
    :8346                                       port number 
    /                    this is a convention   (we don't write htdocs) 
    lab6/whatever                               the name of the script

How would you convert this program to PHP: 

#!/usr/bin/python

def sum(los):
  if len(los) == 0:
    return 0
  else:
    try:
      value = int(los[0]) + sum(los[1:])
    except: 
      value = sum(los[1:])
    return value

print "Content-type: text/html\n\n"

import cgi, random 

data = cgi.FieldStorage()

(deck, deckOne, deckTwo, handOne, handTwo, scoreOne, scoreTwo, feedback) = ("", "", 
"", "", "", "", "", "")

if data.has_key("deck"):     deck     = data["deck"].value
if data.has_key("deckOne"):  deckOne  = data["deckOne"].value
if data.has_key("deckTwo"):  deckTwo  = data["deckTwo"].value
if data.has_key("handOne"):  handOne  = data["handOne"].value
if data.has_key("handTwo"):  handTwo  = data["handTwo"].value
if data.has_key("scoreOne"): scoreOne = data["scoreOne"].value
if data.has_key("scoreTwo"): scoreTwo = data["scoreTwo"].value

if deck: 
  deck = deck.split(",")
  deckOne = deckOne.split(",")
  deckTwo = deckTwo.split(",")
  handOne = deck[0]
  handTwo = deck[1]
  if int(handOne) > int(handTwo): 
    deckOne[0:0] = [handOne]
    deckOne[0:0] = [handTwo]
    feedback = "(%s, %s) Dilbert's hand" % (handOne, handTwo) 
  elif int(handTwo) > int(handOne): 
    deckTwo[0:0] = [handOne]
    deckTwo[0:0] = [handTwo]
    feedback = "(%s, %s) Ratbert's hand" % (handOne, handTwo) 
  else: 
    deckOne[0:0] = [handOne]
    deckTwo[0:0] = [handTwo]
    feedback = "(%s, %s) Tie" % (handOne, handTwo) 
  scoreOne = sum(deckOne)
  scoreTwo = sum(deckTwo)
  deck = deck[2:]
  deck = ",".join(deck)
  deckOne = ",".join(deckOne)
  deckTwo = ",".join(deckTwo)
else: 
  feedback = "Welcome to the game."
  deck = []
  for i in range(13):
    for j in range(4):
      deck.append(str(i))
  random.shuffle(deck) 
  deck = ",".join(deck) 
  scoreOne = "0"
  scoreTwo = "0"

print """
<form> 
  %s <p> 

  Deck: %s <p> 

  <table border>
    <tr> <td> Player   <td> Current score <td> Hand <td> Player Deck 
    <tr> <td> Dilbert: <td> %s            <td> %s   <td> %s 
    <tr> <td> Ratbert: <td> %s            <td> %s   <td> %s 
  </table> 

  <p> Press <input type=submit name=action value=Proceed> to move on. 

  <input type=hidden name=deck    value=%s> 
  <input type=hidden name=deckOne value=%s> 
  <input type=hidden name=deckTwo value=%s> 
  <input type=hidden name=handOne value=%s> 
  <input type=hidden name=handTwo value=%s> 
  <input type=hidden name=scoreOne value=%s> 
  <input type=hidden name=scoreTwo value=%s> 
</form> 
""" % (feedback, deck, scoreOne, handOne, deckOne, scoreTwo, handTwo, deckTwo, deck, deckOne, deckTwo, handOne, handTwo, scoreOne, scoreTwo)