- Access Modifiers 6:04
- Access 3 questions
- Associative Arrays 7:36
- Cleaning Up the Class 2:58
- Accessing Arrays 5 objectives
- Adding Getters and Setters 8:32
- Ready Get Set Go 5 questions
- Static Methods 4:52
- Recipe Details 3:16
- Separating Methods 2:43
- Static 4 objectives
- Magic Methods 5:05
- Magic Constants 6:14
- All About the Magic 5 questions
- Populating the Recipes 3:15
- Controlling the Class 3 objectives
Preview
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Static Methods
4:52Now 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.
Great job getting and
setting all those properties.
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You don't have to set up everything
you'll ever use right off the bat.
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Most likely, you'll be adding features
as you enhance your program,
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and that's great.
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The next feature we should work on is
a method for displaying the recipe.
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We want a single method call that will
pull all the information from the recipe
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and give it to us in
an easy to read format.
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This was the first method
we added to our class.
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We called this method displayRecipe.
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And now we're ready to finish this method.
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This is a great opportunity to talk
about another tenet of object-oriented
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programming, single responsibility.
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The single responsibility principle
states that every class should have
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responsibility over a single part of the
functionality provided by the software.
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And that responsibility should be entirely
encapsulated or contained by the class.
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A class should have only
one reason to change.
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Our Recipe class is in charge of
describing that recipe itself.
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Adding and retrieving data about
a recipe are its main concerns.
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Displaying a recipe is one
way of retrieving data.
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But that display could change based
on where we're using that data,
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not what data we'll be using.
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This is a good place to
break off into a new class.
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Remember, a class is a way to organize
our code and group the functionality and
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data in a logical manner.
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We'll put any methods that
deal with the display or
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rendering of data into a separate group.
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Let's get coding.
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Let's create a new class named Render.
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To do that, we create a new
file in our classes directory.
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We'll name this render.php.
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We add our opening php tags then
create our new class, named Render.
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We can move our displayRecipe
method over here.
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We don't need to store
any data in this class.
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That's all handled by our recipe.
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We just want to use this
method on a particular recipe.
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We can pass a recipe
object into this method.
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Let's add recipe.
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Then we replace the keyword
this with recipe.
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Okay, now how do we use
this method in our script?
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Since we don't need to store any data or
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keep the state of this class, we don't
actually need to instantiate an object.
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By declaring a method as static,
we make it accessible
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outside the class without needing
to make an instance of the class.
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To declare a method as static,
we add the keyword static.
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You can add this before or
after the visibility, but
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make sure you're consistent.
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Back in our cookbook,
we need to include our new class.
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Let's clean up our output again.
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Now we're ready to call our static method.
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We've used static methods before with
the PDO connection to a database.
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To use a static method, we specify
the class, Render, then double colons,
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and the method, displayRecipe.
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Then we'll pass in our recipe.
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We want this to display to screen,
so let's echo.
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Now let's run our script.
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Let's open this console a little further.
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Now, let's run that again.
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We see that we cannot
access the private property
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Recipe::$title in our render file.
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That's right.
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We made this private.
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And because we're no longer
calling it from the same class,
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we'll need to specify our getter.
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So getTitle and getSource.
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These are methods, so we add our
parentheses, and let's try that again.
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Great, my first recipe by Alena Holligan.
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Great job.
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Now we're ready to expand our method to
display the rest of the recipe details.
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