是否可以在没有类的情况下使用命名空间

Question

Is it possible to use namespace without a class?

For example:

namespace Foo;
// rest of the procedural code and functions

Asking because I have notion that namespace are only used where there are classes.

Thanks for your help.

Answer 1

Yes, you can use namespace without a class, like:

//demo.php file
namespace FooDemo;
function first() { return "First"; }
function second() { return "Second"; }
function third() { return "Third"; }

//test.php file
require_once 'demo.php';
foreach (array("first","second","third") as $funcs) {
    echo call_user_func('FooDemo\\'.$funcs);
}

Did you mean something like this