PHP package-private class members

src\MyInternalStuff\myNonPublicWidget.php

<?php
package MyVendor\MyLibrary // acts same as `namespace` but changes all classes into package-private
{
    namespace MyInternalStuff // cause current namespace would be MyVendor\MyLibrary\MyInternalStuff
    {
        class MyNonPublicWidget // class name would be MyVendor\MyLibrary\MyInternalStuff\MyNonPublicWidget
        {
    
        }
    }
}

src\PublicApi.alternative.php

<?php
package MyVendor\MyLibrary
{
    namespace // missing name cause class ns woul be MyVendor\MyLibrary
    {
        public class PublicApi // any package class need to be public prefixed for visibility in lower level namespaces (out of package namespace)
        {
            private $widget;
        
            public function __construct()
            {
                $this->widget = new MyInternalStuff\MyNonPublicWidget();
            }
        }
    }
}

src\PublicApi.php

<?php
package MyVendor\MyLibrary; // acts same as `namespace` but changes all classes into package-private

public class PublicApi // as of we are in package we need to set public visibility in packag lower namespaces
{
    private $widget;

    public function __construct()
    {
        $this->widget = new MyInternalStuff\MyNonPublicWidget();
    }
}

Syntactically package keyword can be used once, there is no possibility for such declaration nesting because it would cause another problem, such: does package in package public class should be visible for upper package namespace only or global namespace either?
It would lead to more complex problems.

The namespace keyword if not providing any name inside package declaration is optional, so provided with missing name has no effect.