phacil-framework/system/templateEngines/Twig/autoload.php

<?php
namespace {
    if (version_compare(phpversion(), '7.0.0', '>') == false) {
        define('TwigFolderLoad', 'Twig1x');
        define('TwigLoaderFilesystem', 'Twig_Loader_Filesystem');
        define('TwigEnvironment', 'Twig_Environment');
        define('TwigSimpleFilter', 'Twig_SimpleFilter');
        define('TwigExtensionDebug', 'Twig_Extension_Debug');

    } else {
        define('TwigLoaderFilesystem', '\Twig\Loader\FilesystemLoader');
        define('TwigEnvironment', '\Twig\Environment');
        define('TwigSimpleFilter', '\Twig\TwigFilter');
        define('TwigExtensionDebug', '\Twig\Extension\DebugExtension');

        if (version_compare(phpversion(), '7.2.0', '>') == false) {
            define('TwigFolderLoad', 'Twig2x');
        } else {
            define('TwigFolderLoad', 'Twig3x');
        }
    }

    include_once TwigFolderLoad."/autoload.php";


    if(TwigFolderLoad == 'Twig1x') {
        if (file_exists(__DIR__ . "/Extension/ExacTITranslate1x.php")) include __DIR__ . "/Extension/ExacTITranslate1x.php";
    } else {
        if (file_exists(__DIR__ . "/Extension/ExacTITranslate.php")) include __DIR__ . "/Extension/ExacTITranslate.php";
    }
}