themes-functionality.php

function jeg_get_all_portfolio_category ($pageid) {
    $category = array();

    $query = new WP_Query(array(
        'post_type' => 'portfolio',
        'meta_query' => array(
            array(
                'key' => 'portfolio_parent',
                'value' => array($pageid),
                'compare' => 'IN',
            )
        ),
        'orderby' => 'menu_order',
        'order' => 'ASC',
        'nopaging' => true
    ));

    $result = $query->posts;
    foreach($result as $key => $value) {
        $termlist = get_the_terms($value->ID, JEG_PORTFOLIO_CATEGORY);
        foreach($termlist as $termkey => $termvalue) {
            $category[$termkey] = $termvalue->name;
        }
    }

    return $category;
}