get_custom_categories() in WordPress

wp_get_custom_categories.php

function get_custom_categories($slug) {

    $args = array(
        'hide_empty'         => 1,
        'orderby'            => 'name',
        'show_count'         => 0,
        'pad_counts'         => 0,
        'hierarchical'       => 1,
        'taxonomy'           => $slug,
        'title_li'           => '',
        'style'              => 'none',
        'echo'               => 0
    );

    $cat = wp_list_categories($args);
    preg_match_all("/<a.*?>(.*?)<\/a>/", $cat, $matches);
    return $matches;
}