1
00:00:04,748 --> 00:00:05,719
Welcome back.

2
00:00:05,719 --> 00:00:08,320
Did you enjoy working with databases?

3
00:00:08,320 --> 00:00:08,880
Welcome back.

4
00:00:08,880 --> 00:00:11,880
I am glad you decided
to keep working hard.

5
00:00:11,880 --> 00:00:15,870
I know that last course took
longer than usual to get through.

6
00:00:15,870 --> 00:00:19,030
Hello and welcome, I am Elena,
a PHP programmer for

7
00:00:19,030 --> 00:00:22,140
over 15 years, and
a teacher here at Tree House.

8
00:00:22,140 --> 00:00:25,280
I'll be your guide through
this journey into PHP.

9
00:00:25,280 --> 00:00:28,450
I'm glad you've chosen to allow tree
house to help you reach your goals.

10
00:00:29,530 --> 00:00:33,610
Doesn't it make you feel special
when contents speak directly to you?

11
00:00:33,610 --> 00:00:36,860
And it makes it so much easier
to find things on our phones and

12
00:00:36,860 --> 00:00:40,490
computers seem to know what we
are looking for, even before we ask.

13
00:00:41,580 --> 00:00:44,540
Which is to expect our phones to know
our locations, when we are looking for

14
00:00:44,540 --> 00:00:47,700
a local service or
trying to get directions.

15
00:00:47,700 --> 00:00:51,770
Websites like Amazon make suggestions
of things we may like to see, and

16
00:00:51,770 --> 00:00:54,510
tell us when our favorite authors
are releasing their latest books.

17
00:00:55,870 --> 00:01:00,600
If you plan a trip using Expedia, the
website keeps track of recent searches for

18
00:01:00,600 --> 00:01:02,470
you in a scratch pad.

19
00:01:02,470 --> 00:01:06,610
This makes it easy to jump back to
view different choices for the trip.

20
00:01:06,610 --> 00:01:10,410
This scratch pad is available without
requiring users to be logged in.

21
00:01:11,830 --> 00:01:14,820
Most of the time, we don't even
realize how much our devices or

22
00:01:14,820 --> 00:01:19,360
websites are set up to assist us until
we try to use a different device or

23
00:01:19,360 --> 00:01:23,650
a new phone and all of a sudden, our
history and settings aren't there anymore.

24
00:01:23,650 --> 00:01:27,100
And it's so much harder to do or
find anything.

25
00:01:27,100 --> 00:01:31,620
Users have come to expect so
much and it's just getting worse.

26
00:01:31,620 --> 00:01:33,850
So, what does that mean
to you as a programmer?

27
00:01:33,850 --> 00:01:37,500
How can you make your own
applications user aware?

28
00:01:37,500 --> 00:01:40,030
It starts with data persistence.

29
00:01:40,030 --> 00:01:43,770
The idea of storing information for
a prolonged period of time.

30
00:01:45,070 --> 00:01:50,790
HTTP, the protocol for exchanging data on
the internet, is a stateless protocol.

31
00:01:50,790 --> 00:01:51,630
This means,

32
00:01:51,630 --> 00:01:56,060
that web servers don't normally keep track
of who's visiting each page on a site.

33
00:01:57,140 --> 00:02:01,440
Servers also don't keep track of visitors
as they click from page to page.

34
00:02:01,440 --> 00:02:07,300
For example, say I visited a sites welcome
page, and then I visited the contact page.

35
00:02:07,300 --> 00:02:10,240
The server doesn't keep
track of that progress and

36
00:02:10,240 --> 00:02:12,090
doesn't know that I was
just on the welcome page.

37
00:02:13,570 --> 00:02:17,420
There are a number of different options
for working with persistent data.

38
00:02:17,420 --> 00:02:19,210
If you've worked with a database or

39
00:02:19,210 --> 00:02:23,940
any file-based data storage, you've
already worked with persistent data.

40
00:02:23,940 --> 00:02:28,330
Multiple pages can access and
know about this same information.

41
00:02:28,330 --> 00:02:33,380
This form of persistance works well when
we want data to be stored long term or

42
00:02:33,380 --> 00:02:36,070
be utilized by multiple users.

43
00:02:36,070 --> 00:02:41,560
We can also make use of a users browser
to keep track of specific information and

44
00:02:41,560 --> 00:02:43,020
tailor the users experience.

45
00:02:44,250 --> 00:02:47,360
In this course,
we'll put together a story building game

46
00:02:47,360 --> 00:02:51,480
that will utilize different types
of browser-based persistence.

47
00:02:51,480 --> 00:02:55,437
The games steps the user through
multiple pages that ask the user for

48
00:02:55,437 --> 00:02:56,975
specific types of words.

49
00:03:06,958 --> 00:03:11,833
Those words will be used in predefined
locations of the string to create an often

50
00:03:11,833 --> 00:03:14,110
comical or nonsensical story.

51
00:03:14,110 --> 00:03:18,115
At the end, a user will be able
to save a story to re-read later.

52
00:03:22,460 --> 00:03:25,870
A user can also play the game again
as many times as they'd like.