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You have completed Object-Oriented PHP Basics!
You have completed Object-Oriented PHP Basics!
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Now that we have all the properties defined and methods for getting and setting those properties in a regulated manner, let’s complete the main action to display the recipe.
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Great job getting and
setting all those properties.
0:00
You don't have to set up everything
you'll ever use right off the bat.
0:03
Most likely, you'll be adding features
as you enhance your program,
0:07
and that's great.
0:11
The next feature we should work on is
a method for displaying the recipe.
0:12
We want a single method call that will
pull all the information from the recipe
0:16
and give it to us in
an easy to read format.
0:22
This was the first method
we added to our class.
0:25
We called this method displayRecipe.
0:28
And now we're ready to finish this method.
0:30
This is a great opportunity to talk
about another tenet of object-oriented
0:34
programming, single responsibility.
0:37
The single responsibility principle
states that every class should have
0:40
responsibility over a single part of the
functionality provided by the software.
0:44
And that responsibility should be entirely
encapsulated or contained by the class.
0:50
A class should have only
one reason to change.
0:57
Our Recipe class is in charge of
describing that recipe itself.
1:00
Adding and retrieving data about
a recipe are its main concerns.
1:06
Displaying a recipe is one
way of retrieving data.
1:10
But that display could change based
on where we're using that data,
1:14
not what data we'll be using.
1:18
This is a good place to
break off into a new class.
1:21
Remember, a class is a way to organize
our code and group the functionality and
1:24
data in a logical manner.
1:29
We'll put any methods that
deal with the display or
1:32
rendering of data into a separate group.
1:35
Let's get coding.
1:38
Let's create a new class named Render.
1:39
To do that, we create a new
file in our classes directory.
1:42
We'll name this render.php.
1:48
We add our opening php tags then
create our new class, named Render.
1:52
We can move our displayRecipe
method over here.
2:03
We don't need to store
any data in this class.
2:14
That's all handled by our recipe.
2:16
We just want to use this
method on a particular recipe.
2:18
We can pass a recipe
object into this method.
2:22
Let's add recipe.
2:25
Then we replace the keyword
this with recipe.
2:29
Okay, now how do we use
this method in our script?
2:36
Since we don't need to store any data or
2:40
keep the state of this class, we don't
actually need to instantiate an object.
2:42
By declaring a method as static,
we make it accessible
2:47
outside the class without needing
to make an instance of the class.
2:51
To declare a method as static,
we add the keyword static.
2:56
You can add this before or
after the visibility, but
3:01
make sure you're consistent.
3:05
Back in our cookbook,
we need to include our new class.
3:07
Let's clean up our output again.
3:18
Now we're ready to call our static method.
3:30
We've used static methods before with
the PDO connection to a database.
3:33
To use a static method, we specify
the class, Render, then double colons,
3:38
and the method, displayRecipe.
3:45
Then we'll pass in our recipe.
3:50
We want this to display to screen,
so let's echo.
3:54
Now let's run our script.
3:59
Let's open this console a little further.
4:04
Now, let's run that again.
4:08
We see that we cannot
access the private property
4:11
Recipe::$title in our render file.
4:14
That's right.
4:20
We made this private.
4:21
And because we're no longer
calling it from the same class,
4:23
we'll need to specify our getter.
4:26
So getTitle and getSource.
4:29
These are methods, so we add our
parentheses, and let's try that again.
4:36
Great, my first recipe by Alena Holligan.
4:43
Great job.
4:47
Now we're ready to expand our method to
display the rest of the recipe details.
4:48
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