Is correct to do this way?
`<ul id="filters" class="clearfix">
<?php
$taxonomy = 'categoria_sistemas_sanitarios';
$terms = get_terms( $taxonomy );
$unique = array();
echo '<li><span class="filter-'. $title . ' active" data-filter="';
$li = ' ';
foreach ( $terms as $term) {
$li .= '.' . $term->slug.', ';
}
$li = rtrim($li, ', ');
echo $li;
echo '">Todos os Sistemas</span></li>';
while ( $filter_query->have_posts() ) : $filter_query->the_post();
$categoria = get_the_terms( $post->ID, 'categoria_sistemas_sanitarios' );
$categoriaSlug = $categoria[0]->slug;
$categoriaName = $categoria[0]->name;
if( ! in_array( $categoriaSlug, $unique ) ) :
$unique[0] = $categoriaSlug;
echo '<li><span class="filter-'. $title . '" data-filter=".' . $unique[0] . '">' . $unique[0] . '</li>';
endif;
endwhile; wp_reset_postdata();
?>
</ul>`