Web Programming – Object Oriented Programming (OOP) Approach

Web programming is an aspect of website development, and the role of a web developer is just as important as a web designer’s role in website design is an aspect of website development. Programming languages ​​have evolved from machine language to low-level language and then to high-level language. The high-level language which is close to the natural language (the language we speak) is written using some methods. Noteworthy are the monolithic and structural programming approaches. Using the coherent method, you write an entire program in one block. In the structured programming approach, the program is divided into groups of symbols called modules where each unit performs a specific task. BASIC, COBOL, PASCAL, C and DBASE running on MS-DOS can be written using both approaches.

After the Windows revolution, it became possible to write programs using a more advanced structured programming approach than the type used on the MS-DOS platform. This is an Object Oriented Programming Approach (OOP) where the program is divided into categories and each category is divided into functions or methods with each job providing a specific service. C ++ and Java are typical examples of Object Oriented Programming Languages ​​(OOP) that were originally developed for non-Internet solutions. As web applications are increasingly preferred according to the historical development of the Internet and the historical development of the web, the need to improve scripting languages ​​has continued, and one of the methods that I followed was through setting up object-oriented scripts. Java Applet and PHP (Hypertext Preprocessor) are two examples of Object Oriented Programming Languages ​​(OOP) for web solutions. PHP was originally non-object oriented but was fully upgraded to Object Oriented Programming Language (OOP) that illustrates the three pillars of Object Oriented Programming (OOP) – encapsulation, inheritance, and polymorphism. Hence, it is possible to write server-side scripts in an object-oriented manner.

Object Oriented Programming (OOP) builds the program into categories, functions, or methods. To use a category and access the services provided by each job, you must create an instance of the category. When an instance is created, an object is preserved with an object variable. This is the object that will now be used to access every job and benefit from its service. The syntax for creating a class instance to create an object differs from one language to another. In PHP, the new keyword is used. For example, if you have a class named Customer and want to create an instance of it and use the object to access the select_records () function in the classroom, you'll talk about it this way –

$ cust = new customer ();

$ cust-> select_records ();

The first line creates an instance of the class client and an object held by the $ cust variable variable. The second line accesses the service provided by the select_records () function with the cust $ object variable. Java also uses the new keyword to create the object, but the keyword implementation in C ++ is different as it is used by a cursor variable while allocating dynamic memory. Earlier I mentioned the three pillars of Object Oriented Programming (OOP) – reflection, inheritance, and polymorphism. They are integral features of PHP. Encapsulation is the process of hiding all the details of an object that do not contribute to its basic properties. This is accomplished by making all instance instances of the class private so that only the class member functions can access its instance variables. Genetics is a situation in which the class derives a set of related traits and behaviors from the parent category. The parent category is called the subclass or subclass and the genetic class is called the subclass. The superclass member variables become member variables in the subclass (a derived class). In PHP, the extended keyword is used to implement the inheritance such as Java, for example

The customer class spans the products

Polymorphism is an extension of inheritance. It is a situation when a subclass exceeds a post in the superclass. When a function or method is overridden, the name and signature of the job in the subclass are kept by the override function in the subclass but there is a change in the job code.

Another important feature of OOP is the creator. The constructor is a function or method with the same name as a class name. It is used to configure member variables and is called once an instance of the class is created unlike other member functions that are called only with the object variable. At this point, let's use the presentation of data with, for example, the Fixed Asset Registration Form for further clarification. Your PHP script needs to retrieve the published data from the form, connect to the database, print custom error messages and insert data into the database table. With an Object Oriented Programming (OOP) approach, you need 4 jobs in a class

  1. Creator to retrieve the data published from the form.
  2. A function to connect to the MySQL database.
  3. Function to insert a record into the database using an INSERT SQL statement.
  4. Function to print custom error messages.

Since the program is in an organized fashion, it is easy to understand and correct. This will be greatly appreciated when dealing with long and complex scripts such as those incorporating basic stock brokerage principles. Within the limits of the programming capabilities of non-object-oriented programming languages ​​for BASIC, COBOL, PASCAL, etc., you can also organize the program by dividing it into smaller controllable units. However, they lack the capabilities of encapsulation, inheritance, and polymorphism in Object Oriented Programming (OOP) which indicates a significant advantage of OOP approaches.

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