How to Use Namespace in PHP

1
NameSpace

• Created by
• www.creativedev.in

2
About Namespace

• Before some days, I dont have idea about
  Namespaces in PHP and I have searched a lot for
  this and i didnt understood it and finally lots
  of headache, I am clear with namespace now and i
  want to share my knowledge with you because if
  you are using PHP 5.3 , you have to know about
  Namespaces and Exceptions.
• Namespaces are the core part of ROR(Ruby on
  Rails). Its new feature in PHP and have released
  before some years round June 2009 in PHP a. We
  can say Namespaces are one of the most
  significant features in PHP 5.3.0 and if we try
  to use if in older version of PHP, error message
  would be appear.
• Namespaces are common concept of OOP because its
  a simply collection of classes, functions and
  objects. We can put any of the PHP code in
  namespace but main purpose of namespace is to
  avoid naming collision of classes, functions and
  variables.

3
Defination

• Namespaces are the way to encapsulate classes,
  functions or constants to a specific library or
  area to solve certain conflicts that can arise
  when two different classes are given the same
  name.With the use of namespaces ,we can avoid the
  naming conflict between one or more classes.when
  you add code under a namespaces, it would be
  unique from others code even if they have the
  same entity name.

4
Where can You Use Namespaces?

• You probably dont need namespaces for small
  applications or applications with only one
  developer, or applications without frameworks of
  third party code but if your application have
  large set of classes libraries and functions
  within class and If your application has more
  than one developer, or you start to use
  third-party libraries,its good to use namespaces
  to keep your code clean, and prevent name
  conflicts in your code, that are difficult to
  find and fix.

5
NameSpace SYNTAX

• namespace ClassName, FunctionName
• To declare a namespace ,keyword namespace is
  used and to use namespace,Scope Resolution
  Operator () or keyword USED is used.
• We should declare the namespace as above and we
  can also create nested namespaces using a
  backslash() between multiple names of namespace.

6
How Do You Use Namespaces?

• First Create one demo.php file and add below
  code
• namespace test
• class Testclass
• function Welcome()
• echo 'Welcome'

7

• And next create Test.php file which can contain
  below code
• include "demo.php"
• test new testTestclass()
• test-gtWelcome()
• // Prints 'Welcome
• Above Example show you the class referenced
  with the Namespace and after that you can use the
  Scope Resolution Operator and instantiate the
  Test class.

8
You can use more than one namespaces in single
file like

• namespace first
•  
• class FirstClass()
• // Code
• namespace second
•  
• class SecondClass()
• // Code

9
How to define Nested namespaces in the same file?

• SYNTAX
• namespace MyFirstNamespacesubnamespace

10
Use Namespace

• Alright, we have declared namespace but how to
  use them its a main thing of it so lets see how
  to use nested namespaces.
• If we want to use namespace in other files, we
  can use it with USE keyword. so USE is most and
  important thing for namespaces.
• SYNTAX
• use MyFirstNamespace
• Now with the use of USE keyword any
  constant, classes, or functions in the file will
  now be part of MyFirstNamespace.

11
Thank You

• ?
• To get more update visit
• www.Creativedev.in