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Classes and Objects
Methods

In addition to properties, we can define class methods – essentially functions each object will contain. Methods are frequently used to interact with an object’s properties in a defined manner.

Methods are defined with the same syntax we use when declaring functions (except they are defined within the curly brackets of a class).

Given a Pet class with first and last name properties, we could provide a method which returns the two properties combined into a full name:

class Pet { public $first, $last; function getFullName() { return $this->first . " " . $this->last; } }

The $this variable refers to the current object; when we invoke this method, $this refers to the specific object that called the method.

Methods are accessed in a similar fashion to properties, using the object operator (->), but in order to invoke them, use parentheses at the end:

$my_object->classMethod();

So, to access the full name of our Pet, we can use the following:

$very_good_groundhog = new Pet(); $very_good_groundhog->first = "Punxsutawney"; $very_good_groundhog->last = "Phil"; echo $very_good_groundhog->getFullName(); # Prints "Punxsutawney Phil"

Instructions

1.

Add a getInfo method to our Beverage class. We’ll be using this method to return some information about our objects.

2.

The method should return this statement about the beverage, with <temperature> and <color> replaced with the beverage’s temperature and color:

"This beverage is <temperature> and <color>."
3.

We’ve created an instance of Beverage and saved it in the variable $soda. We’ve also assigned some values to its properties.

After our code, print the result of calling getInfo on the object (and nothing else).

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