prestashop-module/retailcrm/lib/RetailcrmIcml.php

<?php

class RetailcrmIcml
{
    protected $shop;
    protected $file;
    protected $properties;
    protected $params;
    protected $dd;
    protected $eCategories;
    protected $eOffers;

    public function __construct($shop, $file)
    {
        $this->shop = $shop;
        $this->file = $file;

        $this->properties = array(
            'name',
            'productName',
            'price',
            'purchasePrice',
            'vendor',
            'picture',
            'url',
            'xmlId',
            'productActivity'
        );

        $this->params = array(
            'article' => 'Артикул',
            'color' => 'Цвет',
            'weight' => 'Вес',
            'size' => 'Размер',
            'tax' => 'Наценка'
        );
    }

    public function generate($categories, $offers)
    {
        $string = '<?xml version="1.0" encoding="UTF-8"?>
            <yml_catalog date="' . date('Y-m-d H:i:s') . '">
                <shop>
                    <name>' . $this->shop . '</name>
                    <categories/>
                    <offers/>
                </shop>
            </yml_catalog>
        ';

        $xml = new SimpleXMLElement(
                $string, LIBXML_NOENT | LIBXML_NOCDATA | LIBXML_COMPACT | LIBXML_PARSEHUGE
        );

        $this->dd = new DOMDocument();
        $this->dd->preserveWhiteSpace = false;
        $this->dd->formatOutput = true;
        $this->dd->loadXML($xml->asXML());

        $this->eCategories = $this->dd
                        ->getElementsByTagName('categories')->item(0);
        $this->eOffers = $this->dd
                        ->getElementsByTagName('offers')->item(0);

        $this->addCategories($categories);
        $this->addOffers($offers);

        $this->dd->saveXML();
        $this->dd->save($this->file);
    }

    private function addCategories($categories)
    {
        foreach ($categories as $category) {
            $e = $this->eCategories->appendChild(
                    $this->dd->createElement(
                            'category', $category['name']
                    )
            );

            $e->setAttribute('id', $category['id']);

            if ($category['parentId'] > 0) {
                $e->setAttribute('parentId', $category['parentId']);
            }
        }
    }

    private function addOffers($offers)
    {
        foreach ($offers as $offer) {

            $e = $this->eOffers->appendChild(
                    $this->dd->createElement('offer')
            );

            $e->setAttribute('id', $offer['id']);
            $e->setAttribute('productId', $offer['productId']);

            if (!empty($offer['quantity'])) {
                $e->setAttribute('quantity', (int) $offer['quantity']);
            } else {
                $e->setAttribute('quantity', 0);
            }

            foreach ($offer['categoryId'] as $categoryId) {
                $e->appendChild(
                        $this->dd->createElement('categoryId', $categoryId)
                );
            }

            $offerKeys = array_keys($offer);

            foreach ($offerKeys as $key) {
                if($offer[$key] == null) continue;

                if (in_array($key, $this->properties)) {
                    if(is_array($offer[$key])) {
                        foreach($offer[$key] as $property) {
                            $e->appendChild(
                                $this->dd->createElement($key)
                            )->appendChild(
                                $this->dd->createTextNode(trim($property))
                            );
                        }
                    } else {
                        $e->appendChild(
                            $this->dd->createElement($key)
                        )->appendChild(
                            $this->dd->createTextNode(trim($offer[$key]))
                        );
                    }
                }

                if (in_array($key, array_keys($this->params))) {
                    $param = $this->dd->createElement('param');
                    $param->setAttribute('code', $key);
                    $param->setAttribute('name', $this->params[$key]);
                    $param->appendChild(
                            $this->dd->createTextNode($offer[$key])
                    );
                    $e->appendChild($param);
                }
            }
        }
    }
}