(PHP 5 >= 5.3.0, PHP 7)
Examples:
__NAMESPACE__ example, namespaced code
PHP supports two ways of abstractly accessing elements within the current namespace, the __NAMESPACE__ magic constant, and the namespace keyword.
The value of __NAMESPACE__ is a string that contains the current namespace name. In global, un-namespaced code, it contains an empty string.
1 2 3 4 5 | <?phpnamespace MyProject;echo '"', __NAMESPACE__, '"'; // outputs "MyProject"?> |
__NAMESPACE__ example, global code
1 2 3 4 | <?phpecho '"', __NAMESPACE__, '"'; // outputs ""?> |
using __NAMESPACE__ for dynamic name construction
1 2 3 4 5 6 7 8 9 | <?phpnamespace MyProject;function get($classname){ $a = __NAMESPACE__ . '\\' . $classname; return new $a;}?> |
the namespace operator, inside a namespace
The namespace keyword can be used to explicitly request an element from the current namespace or a sub-namespace. It is the namespace equivalent of the self operator for classes.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <?phpnamespace MyProject;use blah\blah as mine; // see "Using namespaces: Aliasing/Importing"blah\mine(); // calls function MyProject\blah\mine()namespace\blah\mine(); // calls function MyProject\blah\mine()namespace\func(); // calls function MyProject\func()namespace\sub\func(); // calls function MyProject\sub\func()namespace\cname::method(); // calls static method "method" of class MyProject\cname$a = new namespace\sub\cname(); // instantiates object of class MyProject\sub\cname$b = namespace\CONSTANT; // assigns value of constant MyProject\CONSTANT to $b?> |
the namespace operator, in global code
1 2 3 4 5 6 7 8 | <?phpnamespace\func(); // calls function func()namespace\sub\func(); // calls function sub\func()namespace\cname::method(); // calls static method "method" of class cname$a = new namespace\sub\cname(); // instantiates object of class sub\cname$b = namespace\CONSTANT; // assigns value of constant CONSTANT to $b?> |
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