Object Oriented Programming

1
Object Oriented Programming

• Integers, floating point numbers, strings, .. are
  convenient but
• In the real world, we have more complex entities
  we want to deal with users, posts, videos,
• OOP enables us to manipulate these entities as a
  whole

2
OOP in PHP

• Similar concepts to OOP in Java
• Class
• Objects
• Private, protected, public
• Constructors, accessors, mutators

3
OOP in PHP

• function functionName( parameterList )
• // code here
• // function can return a value or an object ..

4
OOP in PHP

• How to instantiate an object
• objectName new ConstructorName( argumentList )
• How to call a function with an object
• result objectName-gtfunctionName( argumentList
  )

5
OOP in PHP

• We can have constants in a class
• const LAST_MONTH December

6
OOP in PHP

• We can have static variables or functions in a
  class (similar to Java)
• static function today( )
• return date

7
OOP in PHP Other concepts (similar to Java)

• Inheritance (keyword is extends)
• Abstract classes and functions (keyword is
  abstract)
• Interfaces
• Inheritance from an interface (keyword is
  implements)
• Phpdoc (online documentation)

8
OOP in PHP Other concepts

• Can use a framework to manage how your web site
  is organized
• Two popular frameworks are
• Cake
• symfony