<?php

use Twig\Compiler;
use Twig\Token;
use Twig\Extension\AbstractExtension;
use Twig\TokenParser\AbstractTokenParser;
use Twig\Node\Node;
use Twig\Loader\FilesystemLoader;
use Twig\Environment;

// creating Twig Tag as Extension
class MyTwigTags extends AbstractExtension
{
    public function getName()
    {
        return 'MyTags';
    }
    
    public function getTokenParsers()
    {
        return [new ListTokenParser()];
    }
}

// parser of the new tag
class ListTokenParser extends AbstractTokenParser
{
    public function getTag()
    {
        return 'list';
    }
    
    public function parse(Token $token)
    {
        $this->parser->getStream()->expect(Token::BLOCK_END_TYPE);
        $body = $this->parser->subparse(array($this, 'decideSpacelessEnd'), true);
        $this->parser->getStream()->expect(Token::BLOCK_END_TYPE);
        
        return new ListNode($body, $token->getLine(), $this->getTag());
    }
    
    public function decideSpacelessEnd(Token $token)
    {
        return $token->test('endlist');
    }
}

// interpretation and execution of tag and its values
class ListNode extends Node
{
    public function __construct($body, $line, $tag) 
    { 
        parent::__construct(array('body' => $body), array(), $line, $tag);
    }
    
    public function compile(Compiler $compiler)
    {
        $compiler
            ->addDebugInfo($this)
            ->write('ob_start();' . PHP_EOL)
            ->subcompile($this->getNode('body'))
            ->write('$list = explode(PHP_EOL, trim(ob_get_clean()));' . PHP_EOL)
            ->write('echo \'<ul>\';' . PHP_EOL)
            ->write('foreach ($list as $node) {' . PHP_EOL)
            ->write('echo \'<li>\' . $node . \'</li>\';' . PHP_EOL)
            ->write('}' . PHP_EOL)
            ->write('echo \'</ul>\';' . PHP_EOL);
    }
}

$path = __DIR__ . '/templates/';
$file = 'list.html.twig';

echo '<b>- template content:</b>' . PHP_EOL;
echo file_get_contents($path . $file) . PHP_EOL;

$loader = new FilesystemLoader($path);
$twig = new Environment($loader);
$twig->addExtension(new MyTwigTags());

echo '<b>- rendered template:</b>' . PHP_EOL;
echo $twig->render($file);

- template content:
My list:
{% list %}
step 1
step 2
step 3
{% endlist %}
- rendered template:
My list:

• step 1
• step 2
• step 3

• Create your own operator in Twig
• Access Interceptor Value Holder of ProxyManager
• Using SFTP with PHPSecLib

PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8