What is namespace in php

Just a note: namespace even nested or sub-namespace cannot be just a number, it must start with a letter. To people coming here by searching about namespaces, know that a consortium has studied about best practices in PHP, in order to allow developers to have common coding standards. Basic example, you have this directory structure :. Read the principles of autoload if you need to know what it means, because it's almost mandatory ;.

I should point out that namespaces were implemented in PHP to resolve name clashes in userland code. While there are coding standards for contributing to PHP core, or for creating extensions, there are none for userland developers who are free to adopt whatever standards they choose.

See how we can use same named class with the help of namespace. This is how namespace resolve naming collision. Namespaces and dynamic language features ». Submit a Pull Request Report a Bug. Syntax for extending classes in namespaces is still the same.

Lets call this Object. Well variables inside namespaces do not override others since variables are never affected by namespace but always global: "Although any valid PHP code can be contained within a namespace, only four types of code are affected by namespaces: classes, interfaces, functions and constants.

They can group other identifiers, including functions , constants , variables , etc. First, create a project directory, e. Second, create src directory in the project directory and Model directory in the src directory. Third, create a new file called Customer. To define a namespace, you place the namespace keyword followed by a name at the very top of the page. To use a class that belongs to a namespace in the index. Since the Customer class now is namespaced, you need to use the fully qualified name that includes the namespace like this:.

To avoid using the fully qualified names from a namespace, you can import the namespace with the use operator like this:.