The following code
<?php
require_once("resources/simple_html_dom.php");
$html = file_get_contents("http://www.volleyvvb.be/?page_id=1083");
$doc = str_get_html($html);
$select = $doc->find("select[name='Reeks']");
foreach ($select as $domElement) {
$child = $domElement->find('option');
foreach($child as $option) {
echo $option->getAttribute('value')."<br>";
}
}
?>
gives me the output you requested.
Liga A H
Liga B H
Ere D
...
An equivalent for the DomCrawler Component would be
$value = $child->nodeValue; // LIGA B HEREN, ...
$attribute = $child->attr('value'); // Liga B H, ...
For further details take a look at the Documentation here.