Render All Joomla! 4 Standard Form Fields

j4xall.php

<?php
declare(strict_types=1);
/**
 * Render All Joomla! 4 Standard Form Fields
 *
 * @version       1.0.0
 * @package       all
 * @author        Alexandre ELISÉ <[email protected]>
 * @copyright (c) 2009-2021 . Alexandre ELISÉ . Tous droits réservés.
 * @license       GPL-2.0-and-later GNU General Public License v2.0 or later
 * @link          https://alexapi.cloud
 */
use Joomla\CMS\Filesystem\File;
use Joomla\CMS\Filesystem\Folder;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormHelper;
use Joomla\CMS\Version;

defined('_JEXEC') or die;

$fieldsPath = JPATH_LIBRARIES . '/src/Form/Field';
FormHelper::addFieldPath($fieldsPath);
$exclude = ['PredefinedlistField.php', 'SubformField.php', 'PluginsField.php'];
$files = Folder::files($fieldsPath, '.php', false, false, $exclude);
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8" ?>
<form name="all">
<fieldset name="all">
<fields name="all" />
</fieldset>
</form>
XML;
$form = Form::getInstance('all', $xml);
if (empty($files)) {
	echo 'No fields found<br>';
	return;
}
foreach ($files as $file)
{
	try
	{
		$type  = strtolower(str_replace('Field','', File::stripExt($file)));
		$extension = $type === 'category' ? ' extension="com_content" ' : '';
		$field = new SimpleXMLElement('<field name="name-of-'.$type.'" type="'.$type.'" label="Label of '.$type.'" description="Description of '.$type.'" '.$extension.' />');
		$form->setField($field, 'all', true, 'all');
	}
	catch (Exception $err)
	{
		echo $err->getMessage() . ' ' . $err->getFile() . ' ' . $err->getLine();
		continue;
	}
}
echo $form->renderFieldset('all');