Properties and Methods

Question 1

The scopes of a property

Answer 1

• public
  
  • accessed from anywhere
• protected
  
  • accessed only from the class itself as well as any parent or inherited classes
• private
  
  • accessed only from the class that defined them

Question 2

If I wanted to define a property or method that was available to the class that created it and its children, what access scope keyword should I use?

Answer 2

protected

Question 3

What three keywords define the access scope of a property?

Answer 3

protected, public, & private

Question 4

What are the following symbols called “->”?

Answer 4

Object Operator

Question 5

To access a property of an object you use the object operator which is made up which characters?

Answer 5

->

Question 6

What best describes the $this pseudo variable?

Answer 6

An internal reference to the current instance of an object.

Question 7

Which of the following best describes a class property?

Answer 7

A variable that is defined inside of a class.

Question 8

1. Add the following public properties to the Fish class: common_name, flavor, and record_weight.

<?php </p>

class Fish {

}

?>

1. Define a constructor on the Fish class with 3 parameters, in order, named $name, $flavor, and $record.
2. In the new constructor method, assign each of the properties on the Fish class with its corresponding parameter variable.
3. Create a Fish object named $bass with the following data:

name: “Largemouth Bass”
flavor: “Excellent”
record: “22 pounds 5 ounces”
1. Create a method on Fish named getInfo that takes no parameters and returns a string that includes the common_name, flavor, and record_weight for the fish. When called on $bass, getInfo might return “A Largemouth Bass is an Excellent flavored fish. The world record weight is 22 pounds 5 ounces.”

Answer 8

<?php </p>

class Fish {
public $common_name;
public $flavor;
public $record_weight;

function __construct($name, $flavor, $record) {
$this->common_name = $name;
$this->flavor = $flavor;
$this->record_weight = $record;
}

public function getInfo() {
return “A $this->common_name . is an $this->flavor . fish. The world record weight is $this->record_weight”;
}
}

$bass = new Fish("Largemouth Bass", "Excellent", "22 pounds 5 ounces");
echo $bass-\>getinfo();

?>