php--Object-oriented summary (2014.5.19)

1: Object-oriented features:

(1): Abstract

(2): encapsulation

(3): Sharing

(4): Emphasizing object structure and not dying program structure

2: Three main features of object-oriented ( encapsulation, inheritance, polymorphism ) indispensable

　　　　Encapsulation: is to encapsulate similar content into a class

Inheritance: The inheritance of family possessions

Polymorphic: Run-time loading

3: Initialize object:__construct (); The function will run automatically when the object is initialized

　　　　Note : __ (This is two slide, be sure not to hit a yo)

If the initialization has parameters, the output must be followed by the

4: Package keyword: public,protected,private

Public: It is public.

5: Encapsulate related functions: __set (), __get ()

__set (): Gets the current class that encapsulates a private property or method re-execution or assignment operation

__get (): Gets the property or method encapsulated in the current class and converted to a common property

6: $this keyword in an object

$this keyword is a system variable that is used to access object properties and Object methods in the current object