microblogED/src/View/Twig.php

<?php

namespace Blog\View;

use Twig\Loader\FilesystemLoader;
use Twig\Environment;

class Twig
{

    protected $twig;
    protected $variables;

    public function __construct($tmpl_folder)
    {
        $loader = new FilesystemLoader($tmpl_folder);
        $this->twig = new Environment($loader, []);
        $this->variables = ['navbar' => [], 'messages' => ['msgs' => []], 'footer' => []];
    }

    protected function load($tmpl)
    {
        return $this->twig->load($tmpl);
    }

    public function addMessage($msg)
    {
        $current = $this->variables['messages']['msgs'];
        $current[] = $msg;
        $this->variables['messages']['msgs'] = $current;
    }

    // add block variables to the global variable bag
    public function addBlockVariable($block, $data)
    {
        $current = $this->variables[$block];
        $new = array_merge($current, $data);
        $this->variables[$block] = $new;
    }

    public function render($tmpl, $vars)
    {
        $template = $this->load($tmpl);
        $variables = array_merge($this->variables, $vars);
        return $template->render($variables);
    }
}