 CLASS
 A blueprint of an object
 Collection of methods and variables
 OBJECT
 Everything we see around us in object
 Instance of a class
 Just like a capsule, where all things remain encapsulated
 Hiding unnecessary details from the user
 Showcasing only the required things to the outside world while hiding the details
 Focus on “what an object does”, instead of how an object is presented or “how it
works”
 Sharing some functionality and properties from one class to another
 Allows code reusability
 Allows you to redefine the way something works, by changing how it is done or by
changing the parts used to get it done
 2 ways
 Overloading
 overriding
 Parent Class
 Base class
 Super class
 Child Class
 Subclass or derived class
 Visibility/Access Modifier
 PHP 3 types of visibility
 Private
 Protected
 Public
 Property
 Class variables
 Method
 function, or behavior
 Static keyword
 Giving access to any property or method without any instance of object, or accessing
property or method directly by class
 “::” Scope Resolution Operator
 Used to indicate static and constant
 “$this” pseudo-variable
 Pseudo-variable originally contained the object of the current class
 If you want to use any non-static property in PHP and non-static method within the class,
use “$this” pseudo-variable
 https://medium.com/@yannmjl/object-oriented-programming-concepts-in-
simple-english-3db22065d7d0
 http://www.w3programmers.com/php-oop-basics/
 http://www.tonymarston.co.uk/php-mysql/abstraction.txt