neolink

.desc {
    position: relative;
}
.desc:hover:after {
    left: 0; top: 0; 
    width: 100%; height: 100%;
    position: absolute;
    content: "";
    background: red url('http://...');
    opacity: 0.5;
}

SELECT *
FROM wp_posts
WHERE ID IN (1,5,4,3)
ORDER BY FIELD(ID,1,5,4,3)

public function __construct()
{
    $this->tags = new ArrayCollection();
}

{% if entity.tags|length %}
   Теги есть!
{% endif %}

{% for tag in entity.tags %}
    {% if not loop.first %}, {%endif %}         
    {% tag.name %}
{% endfor %}

.icon-before(@list...) {
    .do(@index, @list) when (@index <= length(@list)) {
            @name: extract(@list, @index);           
            .icon-@{name}:before {
                content: replace(%("\%a", rgb(0, 232, @index)), "#00", '') 
            }               
           .do(@index + 1, @list);
    }
    .do(1, @list);
}
.icon-before(post, file, book, check, image, globe, data, a1, a2, a3, a4);