Namespace in PHP:
The term namespace is very much common in OOP based language, basically it is a collection of classes, objects and functions.
Namespaces are one of the major change in PHP 5.3.0. Naming collision of classes, functions and variables can be avoided.
We can put any code of PHP within a namespace, but in general class, functions, and constants are placed for easy identification and retrieval.
A namespace is declared with namespace keyword, but we should keep remember that namespace is introduced in PHP 5.3.0 and if we try this in older version of PHP then a error message would appear. The namespace should always declare on the top of the page.
PHP OOP Namespace Example:
We should declare the namespace as above and we can also place a backslash between multiple names of namespace.
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