Для начала нужно скачать composer
Теперь создадим файл composer.json

{
  "require": {
    "jonnyw/php-phantomjs": "3.*",
    "symfony/dom-crawler": "3.*",
    "symfony/css-selector": "3.*"
  },
  "config": {
    "bin-dir": "bin"
  },
  "scripts": {
    "post-install-cmd": [
      "PhantomInstaller\\Installer::installPhantomJS"
    ],
    "post-update-cmd": [
      "PhantomInstaller\\Installer::installPhantomJS"
    ]
  }
}

Скачаем все зависимости

php composer.phar install

Ну и сам парсинг index.php

<?php
require __DIR__ . '/vendor/autoload.php';

$client = \JonnyW\PhantomJs\Client::getInstance();
$request = $client->getMessageFactory()->createRequest('http://superdeals.aliexpress.com/en?spm=2114.11010108.21.1.v65LIL', 'GET');
$response = $client->getMessageFactory()->createResponse();
$client->send($request, $response);
$html = $response->getContent();

$crawler = new \Symfony\Component\DomCrawler\Crawler($html);
$div = $crawler->filter('div.pro-msg');
if($div) {
    echo $div->first()->text();
}

Если выполнить php index.php можно увидеть, что фантом скачал страницу и выполнил javascript код

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