PHP error while (1) Importing a non-compound namespace or (2) Importing any namespace to instantiate a class

An example of a non-compound PHP namespace:

namespace Html;

An example of a compound PHP namespace:

namespace NSHtml;

If I try to import a non-compound PHP namespace, I get the following error:

Warning: The use statement with non-compound name ‘Html’ has no effect in /home/public_html/Samples/PHP/Namespaces/ImportNamespace1.php on line 34

Next, I tried using a compound PHP namespace. Now the above error (while trying to use the namespace) disappears, but when I try to instantiate a class in the imported namespace, I get the error:

Fatal error: Uncaught Error: Class ‘Table’ not found in /home/public_html/Samples/PHP/Namespaces/ImportNamespace1.php:38

I find that what works is a combination of the following:

1. Use a compound namespace
2. Import the class and not the namespace Then, I can instantiate the class without any error along the way.

This is in contrast to what the manual says.

Please note I am using Lightspeed PHP version 7.3.

Here’s the code that works:

Namespace definition: must be compound (in File Namespace1.php):

<?php

  namespace NSHtml;

  class Table
  {
  }
?>

Import and use the class (rather than the namespace) (File ImportNamespace1.php):

      use NSHtmlTable As Table;   # Import and alias the class.

      $table = new Table();

?>

I’d like to ask: Has anyone actually used a non-compound namespace and then imported the namespace (rather than the class) to instantiate a class? Kindly provide actual code.

Answer

If I understand you correctly, I think this is what you are looking for?

namespace b {
    class my_class{
        function test() {
            echo 'here';
        }
    }
}

namespace a {
    use b as c;
    // FQN
    (new bmy_class())->test();
    // Aliased
    (new cmy_class())->test();
}

I would personally never write code like this, nor did I know that you can alias a namespace, but it appears to work.

Demo: https://3v4l.org/79Dmg

Edit

Here’s a version with two files and without bracketed namespaces

<?php

// file b.php
namespace b;

class my_class
{
    function test()
    {
        echo 'here';
    }
}

<?php

// file a.php
namespace a;

use b as c;

require_once 'b.php';

// FQN
(new bmy_class())->test();
// Aliased
(new cmy_class())->test();