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I don't know about you, but I'm constantly adding things to my todo list. In this video we'll look at three ways php gives us to add elements to an array -- two of which let you add elements to the end of the array, and one which lets you add elements to the beginning of the array.
Documentation
- Arrays: add a new element to the end of an array, $array[] = 'New Element Value';
- array_push: push one or more elements onto the end of array.
- array_unshift: prepend one or more elements to the beginning of an array
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Now, that we have our first array set up.
0:00
Let's look at some ways to make
changes to the contents of that array.
0:02
We can add, remove, and
edit elements of our array.
0:06
We'll be using some more
built in PHP functions, so
0:10
it can be helpful to pull up
the manual for these functions.
0:13
The first thing we should look at is
how to add new values to the array.
0:17
I don't know about you, but I'm constantly
adding things to my to do List.
0:22
I'll show you three ways PHP gives
us to add elements to an array.
0:26
Two of which let you add elements
to the end of the array, and
0:30
one which lets you add elements
to the beginning of the array.
0:34
If you want to add one element at a time,
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the easiest way to do that is
to use the following format.
0:41
The array learn, followed by opening and
closing square brackets,
0:45
the assignment operator equal and
then our new value,
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build something awesome.
0:53
Let's use the var_dump instead of implode,
so we can see some more details.
1:00
Now, let's run our script.
1:06
Now, we see all four elements and
PHP automatically assigned
1:11
a numerical key to the new element
by incrementing the largest
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previously used integer key,
1 more than 2 is 3.
1:21
The square brackets tell PHP to
add another element to the array.
1:25
If instead of using square brackets,
we just assign to learn
1:32
We override the entire array and
set learn equal to this new string.
1:40
Let's remove that line.
1:46
Another way to add elements is by using
one of PHP built in array functions.
1:50
Let's check out the manual for
these functions.
1:56
Open a browser and search for
PHP array functions.
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Click on PHP array functions manual.
2:06
As you can see there are many functions
available to use with arrays.
2:09
We'll be covering a few of these
functions in this course, but
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it's a good idea to familiarize
yourself with what's available.
2:17
The first function we'll
look at is array push.
2:21
This is a good choice, if you wanted
to add more than one element at a time.
2:26
You first specify the array, and
then add additional elements each
2:30
separated by comma, just like when
we originally assigned values.
2:36
You can scroll down to see an example.
2:41
Now let's go back to work spaces and
add some more items to our list.
2:46
array_push, the name of our array learn,
and then our new items.
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Functions, forms and objects,
2:58
and let's run the script.
3:04
We can see these new values
added to the end of the array.
3:11
Both of these options added
elements to the end of the array.
3:16
There is a third option that lets us add
elements to the beginning of the array.
3:20
Let's go back to the manual.
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If we scroll down,
you can see the see also heading,
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and there you'll find array_unshift.
3:33
array_unshift works in
the same way as array_push.
3:36
First, we specify the array, and
then we add additional elements.
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Each separated by a comma.
3:46
Let's go back to work spaces.
3:48
Let's add array_unshift,
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specify our array, learn, and
3:55
then add our elements, HTML and CSS.
4:00
Now let's pull the console up,
and run our script.
4:08
Now we can see these two elements
added to the beginning of our array.
4:15
The main difference is that array_unshift
will add elements to the beginning of
4:20
the array, while array_push added
the elements to the end of the array.
4:25
Another difference is how these
functions affect the array key index.
4:30
Array push will add the next
index number in order, so
4:35
if the array keys are one, three, five and
4:40
you add another with your a push,
you will have one,
4:44
three, five, six.
array_unshift will update the index.
4:49
If you add another one to the beginning
now will have zero, one, two, three, four.
4:55
We'll take a closer look at how the index
affects arrays in the next video.
5:03
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