Skip to main content

Object Oriented Programming

By
PHP is an object- oriented programming language.

What is object-oriented programming (OOP)?

Object-oriented programming(OOP) is a programming language using objects usually instances of a class, consisting of data fields and methods together with their interactions to design applications and computer programs.

Main features of OOP are as below:

 Class and object:
    A class is a group of objects and an object is an instance of a class. It contains the code for properties and methods.


Encapsulation:
    Encapsulation is the ability of an object to protect the data (properties) of a class from outside influences. You can use a class (its properties) through an object instance, without having access to its code.

Inheritance:
    Inheritance is the ability of a class to copy or inherit the properties and methods of a parent class.

Polymorphism:
    Polymorphism is a class ability to do more different things, or use one class or another to achieve the same thing, having similar functions.

Labels

Labels:

Comments

Post a Comment

Popular posts from this blog

MySQL Connection

By
Connection with MySQL Database Before accessing database, you must create a connection to the database Syntax: mysql_connect(servername,username,password); where, servername specifies the server to connect to. Default value is “localhost” username specifies the username to log in with. Default value is the name of the user that owns the server process. To connect offline we use username “root”. password specifies the password to log in with. Default is “” Code : Creating connection to the database and selecting the required database <?php $con = mysql_connect(“localhost”,”root”,”"); if (!$con) { die(‘Could not connect: ‘ . mysql_error()); } else{ mysql_select_db(“test”, $con) }; ?> Here, we have store connection in a variable called $con and trap error using die function. Closing connection The connection will be closed automatically when the script ends. To close the connection before, use the mysql_close() function: <?php $con = mysql_conne...
Post a Comment
Read more

Join in MySQL

By
Join clause is used to combine rows from two or more tables depending upon common field between them. There are different kinds of Joins. The most common and useful Join is Inner Join. Inner Join: It will return all rows from multiple tables where the condition is met.
Post a Comment
Read more

Div and span

By
Div: Div <div> tag is that it divides the HTML document into sections. Proper usage of the <div> tag is fundamental to good HTML coding, the <div> tag is one of the most powerful tools available to a web developer. Span: Span <span> is  in-line level elements, they only span across small amounts of content, typically words or phrases. For example: a <span> tag might be used to make a word red in color or to give it an underline.
Post a Comment
Read more