$('#cart > button').html('<span id="cart-total"><i class="fa fa-shopping-cart"></i> ' + json['total'] + '</span>');

var getAmount = function (total) {
	var regex = /\s+/,
		amount = total.split(regex)[1];
		return amount;
}

$('#button-cart').on('click', function() {...}

$_['text_items'] = 'Товаров %s';//  (%s)';

$_['text_items'] = 'Товаров %s';//  (%s)';

$_['text_items'] = '%s';

$template = $this->config->get('theme_default_directory'); //тема по умолчанию
$data['template'] = $template;
$data['last_time_style'] = filemtime(DIR_TEMPLATE.$template.'/stylesheet/stylesheet.min.css');
$data['last_time_script'] = filemtime(str_replace('theme/', '', DIR_TEMPLATE).'javascript/common.min.js');

<link href="catalog/view/theme/{{template}}/stylesheet/stylesheet.min.css?{{last_time_style}}" rel="stylesheet">
<script src="catalog/view/javascript/common.min.js?{{last_time_script}}" type="text/javascript"></script>

$data['options'] = array();

					foreach ($this->model_catalog_product->getProductOptions($product_id) as $option) {
						$product_option_value_data = array();

						foreach ($option['product_option_value'] as $option_value) {
							if (!$option_value['subtract'] || ($option_value['quantity'] > 0)) {
								if ((($this->config->get('config_customer_price') && $this->customer->isLogged()) || !$this->config->get('config_customer_price')) && (float)$option_value['price']) {
									$price = $this->currency->format($this->tax->calculate($option_value['price'], $product_info['tax_class_id'], $this->config->get('config_tax') ? 'P' : false), $this->session->data['currency']);
								} else {
									$price = false;
								}

								$product_option_value_data[] = array(
									'product_option_value_id' => $option_value['product_option_value_id'],
									'option_value_id'         => $option_value['option_value_id'],
									'name'                    => $option_value['name'],
									'image'                   => $this->model_tool_image->resize($option_value['image'], 50, 50),
									'price'                   => $price,
									'price_prefix'            => $option_value['price_prefix']
								);
							}
						}

						$data['options'][] = array(
							'product_option_id'    => $option['product_option_id'],
							'product_option_value' => $product_option_value_data,
							'option_id'            => $option['option_id'],
							'name'                 => $option['name'],
							'type'                 => $option['type'],
							'value'                => $option['value'],
							'required'             => $option['required']
						);
					}

{% if options %}
            {% for option in options %}
            {% if option.type == 'select' %}
            <div class="form-group{% if option.required %} required {% endif %}">
              <label class="control-label" for="input-option{{ option.product_option_id }}">{{ option.name }}</label>
              <select name="option[{{ option.product_option_id }}]" id="input-option{{ option.product_option_id }}" class="form-control">
                <option value="">{{ text_select }}</option>
                {% for option_value in option.product_option_value %}
                <option value="{{ option_value.product_option_value_id }}">{{ option_value.name }}
                {% if option_value.price %}
                ({{ option_value.price_prefix }}{{ option_value.price }})
                {% endif %} </option>
                {% endfor %}
              </select>
            </div>
            {% endif %}

Array
(
    [products] => Array
        (
            [3] => Array
                (
                    [product_id] => 30
                    [thumb] => https://mysite/image/cache/catalog/demo/canon_eos_5d_1-200x200.jpg
                    [name] => Canon EOS 5D
                    [model] => Product 3
                    [description] => 
	Canon's press material for the EOS 5D states that it 'defines (a) new D-SLR category', while we'r..
                    [price] => 50.00р.
                    [special] => 80.00р.
                    [tax] => 
                    [rating] => 
                    [options] => Array
                        (
                            [product_option_id] => 226
                            [product_option_value] => Array
                                (
                                    [0] => Array
                                        (
                                            [product_option_value_id] => 15
                                            [option_value_id] => 39
                                            [name] => Red
                                            [image] => 
                                            [price] => 
                                            [price_prefix] => +
                                        )

                                    [1] => Array
                                        (
                                            [product_option_value_id] => 17
                                            [option_value_id] => 41
                                            [name] => Green
                                            [image] => 
                                            [price] => 10.00р.
                                            [price_prefix] => +
                                        )

                                    [2] => Array
                                        (
                                            [product_option_value_id] => 16
                                            [option_value_id] => 42
                                            [name] => Yellow
                                            [image] => 
                                            [price] => 50.00р.
                                            [price_prefix] => +
                                        )

                                )

                            [option_id] => 5
                            [name] => Select
                            [type] => select
                            [value] => 
                            [required] => 1
                        )

                    [href] => https://soniya-shop/index.php?route=product/product&product_id=30
                )

        )

)

{% for product in products %}
    {% if product.options %}
        {% for option in product.options %}
        {% if option.type == 'select' %}
            ...

{% for product in products %}

$arr = [
    3 => [
        12,
        45       
    ]
];

{% for product in products %}
    {% if product is iterable %}
        {% for item in product %}
            {{ item }}
        {% endfor %}
    {% else %}
        {{ product }} 
    {% endif %}
{% endfor %}

$arr = [
    'product_id' => 30,
    'thumb' => 'https://mysite/image/cache/catalog/demo/canon_eos_5d_1-200x200.jpg',
    'name' => 'Canon EOS 5D',
    'model' => 'Product 3',
    'description' => 'Canon press material for the EOS 5D',
    'price' => '50.00р',
    'special' => '80.00р',
    'options' => [
        'product_option_id' => 226,
        'product_option_value' => [
            [
                'product_option_value_id' => 15,
                'option_value_id' => 39,
                'name' => 'Red'
            ],
            [
                'product_option_value_id' => 17,
                'option_value_id' => 41,
                'name' => 'Green'
            ],
            [
                'product_option_value_id' => 16,
                'option_value_id' => 42,
                'name' => 'Yellow'
            ]
        ],
        'option_id' => 5,
        'name' => 'Select',
        'type' => 'select',
        'required' => 1
    ],
    'href' => 'https://soniya-shop/index.php?route=product/product&product_id=30'
];

<ul>
{% for key, val in arr %}
    {% if key == 'options' %}
        <ul>
            {% for k, v in val %}
                {% if k == 'product_option_value' %}
                    <ul>
                        <li>{{ v }} опять вложение, цикл</li>
                    </ul>
                {% else %}
                    <li>{{ v }}</li>
                {% endif %}
            {% endfor %}
        </ul>
    {% else %}
        <li>{% if key == 'href' %}{{ val|raw }}{% else %}{{ val }}{% endif %}</li>
    {% endif %}
{% endfor %}
</ul>

include_once('library/template/Twig/Autoloader.php');
Twig_Autoloader::register();
$loader = new Twig_Loader_Filesystem('templates');
$twig = new Twig_Environment($loader); //без кеширования

//определяем что-то для передачи в шаблон

echo $twig->render('имя файла шаблона', ['name_for_twig' => $data]);

$children_data[] = array(
	'name'  => $child['name'] . ($this->config->get('config_product_count') ? ' (' . $this->model_catalog_product->getTotalProducts($filter_data) . ')' : ''),
	'href'  => $this->url->link('product/category', 'path=' . $category['category_id'] . '_' . $child['category_id'])
);

{% if description and description != "<p><br></p>" %}
<div class="col-sm-10">{{ description }}</div>
{% endif %}</div>