Wordpress Taxonomy Tree

style_basic.css

    .is-current-cat {
        color: red !important
    }
    .cat-parent > li > ul {
        padding-left: 20px;
        display: none
    }
    .cat-parent > li > .is-current-cat + ul {
        display: block
    }

tax_tree.php

<?php
function wpa_get_tax_tree($parent) {
	global $wp_query;
	$tax        = $wp_query->queried_object->taxonomy;
	$terms      = get_terms($tax, array( "orderby" => "slug", "parent" => $parent, 'hide_empty' => 0 ) );
	$currTerm   = $wp_query->queried_object;

	if ( ! empty( $terms ) && ! is_wp_error( $terms ) ) {
		echo '<ul class="cat-parent">';
		foreach ( $terms as $term ) {
		    $hasChild = get_term_children( $term->term_id, $tax );
		    ?>
            <li>
                <a href="<?php echo get_term_link($term); ?>" class="<?php echo ($currTerm->term_id === $term->term_id || in_array($currTerm->term_id, $hasChild) )?'is-current-cat':''; ?>"><?php echo $term->name; ?></a>
				<?php if($hasChild) laser_get_tax_tree($term->term_id); ?>
            </li>
		<?php }
		echo '</ul>';
	}
}

wpa_get_tax_tree(0);