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14th Aug 2012
Advanced Object Oriented PHP Features

With the launch of PHP5 in 2004, PHP developers finally got empowered of object-oriented programming (OOP) infrastructure. Because of the ease and efficiency of application development, OOP is the most prominent paradigm of modern-day development platforms.

Here is a list of advanced object-oriented programming PHP features:

Class and object

Class is a developer-specified data type that comprises of local functions and local data. In PHP object oriented programming, class can be thought of as a blueprint or template. In class, you can create so many similar kinds of cases, know as objects. For example, flower is a class, where lily, rose are the objects of class ‘flower’. Objects are also acknowledged as ‘instances’.

Constructor and Destructor

As similar to other OOP languages, PHP also boasts of constructor method for classes. Here, constructor is a special type of function which is called automatically whenever an object is created in the class. At the same time, PHP also supports destructor, which is called automatically every time an object is erased. This concept has been incorporated in PHP 5.


When a class is defined by taking over the current functionality of a parent class, the property or concept is known as ‘inheritance’. The child class will accede to all or some of the functions and variables of a parent class. Due to this attribute, the classes and objects find more scalability and flexibility in coding. Simultaneously, you must be aware that the inheritance property can be used when the structure and actions are diverse.


In object oriented programming paradigm, Polymorphism performs at two instances: Compile time and Run time. Function overloading and operator overloading are some of the examples of compile time polymorphism. In function overloading, we can create multiple functions on same name, but it should have a different data type and different number of parameters. However, PHP doesn’t support function overloading and operator overloading. It supports inheritance and virtual functions as Run time polymorphism and function overriding.

Data Abstraction

The data abstraction concept is introduced in PHP 5. If the class contains abstracted (hidden) data, then it is known as an abstract class and the method of implementing such class is known as data abstraction. The idea behind the data abstraction is that we can extend the class by its inheritor class or classes.

Auto Loading

Before the release of PHP 5.0, PHP programmers need not to define class every time they create a new object. A new feature ‘Auto loading’ enables the programmers to call the class or interface which isn’t defined yet. Using this auto loading attribute, classes can be accessed from PHP files as and when needed.

Type Hinting

Type hinting is another great attribute brought in with the release of PHP 5. By defining the name of the particular class in the type hinting function prototype, programmers can explicitly classify values in objects, interfaces or arrays. Type hints aren’t applicable to scalar types such as ‘string’ or ‘int’. If class is specified as type hint, everything within a class is by default considered with type hinting prototype.

Object Cloning

It’s the cloning of PHP objects meaning the process of creating duplicate copies of an original object. The object cloning varies a bit in PHP 5 than its earlier version PHP 4. In PHP5, clone constructs and magic method is used to create a superficial copy of the original object. You may later on change the cloned object properties as and when required.


It is a technique of wrapping data structures and code that function on them within a single entity. Or in simple words, encapsulation is a property of an object which makes it behaves as a container for data variables and functions. Due to this mechanism, the internal workings are hidden from the outside interfaces protecting the code and data from getting misused or accessed without permission.

Interface Class

PHP interface class is alike the interface in Java. Only unimplemented function definitions are defined in the interface class body, and the body part of method function is coded in derived class. All the variables and methods in the interface class should be defined as constant only, and it can’t be modified in the child classes as well. We can create multiple interfaces and one interface can be created by another one.

There are many other advanced OOP features supported by PHP such as Auto loading, Type Hinting, object cloning, encapsulation and interface class. Hire a PHP development Company and leverage the best of PHP object-oriented platform can offer, that too at the most affordable rate.


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