Ola

<?php


function getSubPagesSortedByMenu($forPageID){
    return get_pages(array(
        sort_order => asc,
        sort_column => menu_order,
        child_of => $forPageID
    ));
}

function getCurrentPageID() {
    if(have_posts()) {
        while(have_posts()) {
            the_post();
            $current_page_id = get_the_ID();
        }
    }
    return $current_page_id;
}

echo '<div id="portfolio-columns">';
    foreach (getSubPagesSortedByMenu(getCurrentPageID()) as $child){
        echo '<div class="portfolio_page_post '. $child->post_name .'">';
        echo "<h2>".$child->post_title."</h2>";
        echo '<div class="entry">'.$child->post_content."</div>";
        echo "</div>";
    }
echo '</div>';
?>