Question

I have studied the use of Namespaces in PHP a while back but recently looking at a project that used the use keyword and then accessed the namespaced object as if they were normal without namespace.

My question is, is the code below correct, it hs a file index.php and uses the namespace MyLibrary\Base it then uses use to bring in \MyLibrary\Registry \MyLibrary\User and \MyLibrary\Request

It then can access any of these object without putting there namespace in front of them, so the actual code below the use section looks like a normal pre-namespace php file.

I am asking if this is how you use namespaces? Or am I missing something?

File: index.php

<?php
namespace MyLibrary\Base;

use \MyLibrary\Registry;
use \MyLibrary\User;
use \MyLibrary\Request;


class Base
{
    public $registry;

    function __construct($registry)
    {
        $this->registry = $registry;
        $this->user = New User;
        $this->request = new Request;
        # code...
    }
}
?>

File: registry.class.php

<?php
namespace MyLibrary\Registry;

class Registry
{
    public $user;

    function __construct($user)
    {
        $this->user = $user;
        # code...
    }
}
?>

Answer 1

Yes. The use-statement imports the class- or namespace-name into the current scope. To write everything that short is the reason, why the PHP-devs implemented namespaces 😉

namespace MyFirstNamespace {
    class Foo {}
}
namespace MySecondNamespace {
    use \MyFirstNamespace\Foo as Bar;
    $foo = new Bar;
}

a) it make everything more readable, because its much shorter, than Vendor_Package_Foo_Bar_XyzClass and b) you can exchange the classes to use very fast.

# use \MyFirstNamespace\Foo as Bar; // I don't like Foo anymore
use \MyFirstNamespace\SimilarToFoo as Bar;