Using namespaces

An aspect that is critical to advanced PHP development is the use of namespaces. The arbitrarily defined namespace becomes a prefix to the class name, thereby avoiding the problem of accidental class duplication, and allowing you extraordinary freedom of development. Another benefit to the use of a namespace, assuming it matches the directory structure, is that it facilitates autoloading, as discussed in Chapter 1, Building a Foundation.

How to do it...

  1. To define a class within a namespace, simply add the keyword namespace at the top of the code file:
    namespace Application\Entity;


    Best practice

    As with the recommendation to have only one class per file, likewise you should have only one namespace per file.

  2. The only PHP code that ...

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