PHP Namespaces Declaring namespaces
Example
A namespace declaration can look as follows:
namespace MyProject;- Declare the namespaceMyProjectnamespace MyProject\Security\Cryptography;- Declare a nested namespacenamespace MyProject { ... }- Declare a namespace with enclosing brackets.
It is recommended to only declare a single namespace per file, even though you can declare as many as you like in a single file:
namespace First {
class A { ... }; // Define class A in the namespace First.
}
namespace Second {
class B { ... }; // Define class B in the namespace Second.
}
namespace {
class C { ... }; // Define class C in the root namespace.
}
Every time you declare a namespace, classes you define after that will belong to that namespace:
namespace MyProject\Shapes;
class Rectangle { ... }
class Square { ... }
class Circle { ... }
A namespace declaration can be used multiple times in different files. The example above defined three classes in the MyProject\Shapes namespace in a single file. Preferably this would be split up into three files, each starting with namespace MyProject\Shapes;. This is explained in more detail in the PSR-4 standard example.
