BypassWithClosure.php

<?php declare(strict_types = 1);


//-------------------------------------------
//
//  FIRST NAMESPACES
//
//-------------------------------------------

namespace FST{
    

echo "in namespace : ".__NAMESPACE__.PHP_EOL;

class Pippo
{ 
  protected int $value = 10;
  
  private final function __construct()
  {
  }
  
  protected static function create():static
  {
    return new static();
  }

  function hello():void
  {
      echo "inside Pippo : HELLO!".PHP_EOL;
  }
  
  function value():int
  {
      return $this->value;
  }
 }

}


//-------------------------------------------
//
//  SECOND NAMESPACES
//
//-------------------------------------------

namespace SND{

use FST\Pippo;

echo "in namespace : ".__NAMESPACE__.PHP_EOL;

class Pluto extends Pippo
{
  
  protected static function create():static
  {
    /** @var static $result **/ $result = parent::create();
    $result->value=20;
    return $result;
  }
  
  function hello():void
  {
      echo "inside Pluto (extension of Pippo) HULLO!".PHP_EOL;
  }
  
  function modified():int
  {
      return $this->value+10;
  }
 }

}


//-------------------------------------------
//
//  GLOBAL NAMESPACES
//
//-------------------------------------------

namespace{

use FST\Pippo;
use SND\Pluto;

echo "in namespace : ".__NAMESPACE__.PHP_EOL;

/**
 * @template T
 * @param class-string<T> $clazz
 * @return T
 * @throw \RuntimeException
 */
function create(string $clazz):mixed
{

    echo "creating a $clazz".PHP_EOL;
    
    /** @var \Closure():T|false $result */
    $result =  \Closure::bind(
        function() use ($clazz)
        {
            /** @var callable():T $cTor */ 
            $cTor = [$clazz,'create'];
            return $cTor();
        },
        NULL,
        $clazz);
    
    if($result !== false){
        return $result();
    }
    throw new \RuntimeException("can't create $clazz!");
}



$pippo = create(Pippo::class);
$pippo->hello();

$pluto = create(Pluto::class);
$pluto->hello();

echo var_export($pippo,true).PHP_EOL;
echo var_export($pluto,true).PHP_EOL;

}