Get custom Taxonomy with empty also in wordpress

<?php
$terms = get_terms( array(
    'taxonomy' => 'vehicle_type',
    'hide_empty' => false,
) );
$count = count( $terms );
if ( $count > 0 ) {
    echo '<h3>Total Projects: '. $count . '</h3>';
    echo '<ul>';
    foreach ( $terms as $term ) {
        echo '<li>' . $term->name . '</li>';
    }
    echo '</ul>';
}
?>

OR

$terms = get_terms( 'post_tag', array(
    'hide_empty' => false,
) );