How does inheritance work in a PHP program?
Inheritance is a method of creating a new class by inheriting a base class. The object of the new class will be able to access all members of the new class, as well as the base class, through inheritance. In this way, the same code can be reused many times by writing it only once. PHP uses the extend keyword for inheritance.
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How to create an inheritable class in PHP?
In such a case, you must explicitly reference the class name using the :: operator. Fortunately, just like using the ‘parent’ keyword, PHP correctly recognizes that you are calling the function from a protected context within the object’s class hierarchy. You can force a class to be strictly an inheritable class by using the “abstract” keyword.
How are classes and objects related in PHP?
This principle will affect how many classes and objects relate to each other. For example, when you extend a class, the subclass inherits all public and protected methods of the parent class. Unless a class overrides those methods, they will retain their original functionality.
How is the Strawberry class inherited in PHP?
The Strawberry class is inherited from the Fruit class. This means that the Strawberry class can use the public $name and $color properties, as well as the public __construct() and intro() methods of the Fruit class due to inheritance. The Strawberry class also has its own method: message().
Inheritance in PHP. Inheritance is a mechanism to extend an existing class by inheriting a class, we create a new class with all the functionality of that existing class and we can add new members to the new class.
Can a parent class be extended in PHP?
Any class can be extended unless it is declared with the final keyword. When a class is extended, we consider it the parent class and the class being extended as the subclass. Proper use of class inheritance requires a strong understanding of property and method visibility, which I covered in depth here.