Composer autoload fails to find the class. What could be wrong?

Question

PHP

Connected two libraries phpQuery and CURL. Everything is ok with the first one, but CURL does not want to be loaded automatically.
Here is what I have in my code:

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

$pageText = new Curl();
$page = $pageText->get_page(URL);
$cat_page = phpQuery::newDocument($page);

throws an error: "Fatal error: Class 'Curl' not found in D:\domains\phpQuery\index.php on line 4";
I checked the vendor folder, all the libraries are there.
Here is my json just in case:

{
    "require": {
        "electrolinux/phpquery": "^0.9.6",
        "curl/curl": "^1.8"
    }
}

Answer 1

Don't forget that classes can have a namespace:

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

$pageText = new Curl\Curl();
$page = $pageText->get_page(URL);
$cat_page = phpQuery::newDocument($page);

Or:

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

use Curl\Curl;

$pageText = new Curl();
$page = $pageText->get_page(URL);
$cat_page = phpQuery::newDocument($page);

Answer 2

Judging by the code namespace is not specified. See which one is used in the Curl library.