1
00:00:00,096 --> 00:00:05,162
[MUSIC]

2
00:00:05,162 --> 00:00:09,832
PHP has tons of built in functions to make
your life as a PHP developer so

3
00:00:09,832 --> 00:00:11,210
much better.

4
00:00:11,210 --> 00:00:14,870
But first, we need to know how to find
them, and how to read the docs.

5
00:00:14,870 --> 00:00:16,976
So let's jump in.

6
00:00:16,976 --> 00:00:22,050
Okay, so, from Google search I'm just
gonna type in PHP built in.

7
00:00:23,300 --> 00:00:26,330
Okay, built in functions, and

8
00:00:26,330 --> 00:00:30,070
our first result should be PHP internal
built in functions manual.

9
00:00:30,070 --> 00:00:35,050
So you'll see this is gonna take us to
php.net/manual/en for

10
00:00:35,050 --> 00:00:38,310
English, and then functions internal PHP.

11
00:00:38,310 --> 00:00:39,940
If you look at the second paragraph,

12
00:00:39,940 --> 00:00:44,790
there's a section here that says, how to
read a functions definition.

13
00:00:44,790 --> 00:00:48,400
So taking a look at this we understand our
data types.

14
00:00:48,400 --> 00:00:51,160
We've gone over that in a previous lesson.

15
00:00:51,160 --> 00:00:54,600
So what we're gonna look at is how it is
defined.

16
00:00:54,600 --> 00:00:58,910
So for instance, we're looking at string
length as our first example.

17
00:00:58,910 --> 00:01:02,620
So what you'll see, is that there is a
function name,

18
00:01:02,620 --> 00:01:07,954
then it will show you when it's been
around, so it's been in PHP4 and PHP5.

19
00:01:07,954 --> 00:01:13,245
It's going to return an integer value, so
you'll see here it says int strlen length,

20
00:01:13,245 --> 00:01:18,080
and then inside of that, it'll show you
the argument you pass through.

21
00:01:18,080 --> 00:01:21,445
It starts by showing you what kind of
argument it expects.

22
00:01:21,445 --> 00:01:24,800
So it expects a string, and then you pass
through a variable, and

23
00:01:24,800 --> 00:01:27,140
in this case it just says, string.

24
00:01:27,140 --> 00:01:30,270
So then, it tells you the result.

25
00:01:30,270 --> 00:01:34,000
It'll say it will return the length of a
given string.

26
00:01:34,000 --> 00:01:37,380
So that's a very, very simple way to look
at the docs.

27
00:01:37,380 --> 00:01:40,150
Let's look at string length actually
defined.

28
00:01:40,150 --> 00:01:42,410
There's actually a link right up here to
it.

29
00:01:42,410 --> 00:01:46,160
And then we can see how the docs actually
look to us.

30
00:01:46,160 --> 00:01:51,560
So you'll see here under strlen, we see
PHP 4, PHP 5,

31
00:01:51,560 --> 00:01:56,120
and then a quick description which just
says, get string length.

32
00:01:56,120 --> 00:01:57,910
Then, what it expects.

33
00:01:57,910 --> 00:02:01,480
Int means it expects an integer, then you
have the keyword,

34
00:02:01,480 --> 00:02:04,060
which is strlen, which is the actual
function.

35
00:02:04,060 --> 00:02:07,842
Then the arguments that you pass through
have to be a string, and then you

36
00:02:07,842 --> 00:02:11,947
just pass through a single argument that
is required, dollar sign, string.

37
00:02:11,947 --> 00:02:16,700
It'll return to you, the length of the given
string as an integer.

38
00:02:16,700 --> 00:02:21,380
So that's a very basic example of how to
read the documentation.

39
00:02:21,380 --> 00:02:25,750
Now, we're gonna do some more, starting
with how to look at string functions.