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The “static” keyword in PHP is used to define static properties and static methods in a PHP class. It may be noted that the static keyword is also used to define static variable, and static anonymous functions. Read this chapter to learn about the static properties in a PHP class. In a class definition, a…

The “static” keyword in PHP is used to define static properties and static methods in a PHP class. It may be noted that the static keyword is also used to define static variable, and static anonymous functions. This chapter discusses static methods in a PHP class. In a class definition, a function declared with a…

In PHP, a class can inherit only from one parent class, multiple inheritance is not defined in PHP. Traits in PHP have been introduced to overcome this limitation. You can define one or more method in a trait, which can be reused freely in various independent classes. Syntax The “trait” keyword is used as per…

Just as a class is a template for its objects, an interface in PHP can be called as a template for classes. We know that when a class is instantiated, the properties and methods defined in a class are available to it. Similarly, an interface in PHP declares the methods along with their arguments and return value.…

The list of reserved words in PHP includes the “abstract” keyword. When a class is defined with the “abstract” keyword, it cannot be instantiated, i.e., you cannot declare a new object of such a class. An abstract class can be extended by another class. As mentioned above, you cannot declare an object of this class. Hence,…

PHP allows an identifier in a class to be defined as a “class constant” with a constant value, the one that remains unchanged on a per class basis. To differentiate from a variable or property within class, the name of the constant is not prefixed with the usual “$” symbol and is defined with the…

Inheritance is one of the fundamental principles of object-oriented programming methodology. Inheritance is a software modelling approach that enables extending the capability of an existing class to build new class instead of building from scratch. PHP provides all the functionality to implement inheritance in its object model. Incorporating inheritance in PHP software development results in…

In PHP, the keywords public, private and protected are known as the access modifiers. These keywords control the extent of accessibility or visibility of the class properties and methods. One of these keywords is prefixed while declaring the member variables and defining member functions. Whether the PHP code has free access to a class member, or it is restricted from…

As in most of the object-oriented languages, you can define a constructor function in a class in PHP also. When you declare an object with the new operator, its member variables are not assigned any value. The constructor function is used to initialize every new object at the time of declaration. PHP also supports having…

The concept of classes and objects is central to PHP’s object-oriented programming methodology. A class is the template description of its objects. It includes the properties and functions that process the properties. An object is the instance of its class. It is characterized by the properties and functions defined in the class. Defining a Class in PHP To define…