wp_query filtering problem tax_query

Hi!
I have a problem with my filtering method.
I have a form with multiple filtering options. I put these options in my url and I get them with GET. Except that if I put “All”, nothing is shown because then my category and my tag are equal to nothing.

<?php
        if($_GET['category'] && !empty($_GET['category']))
        {
            $category = $_GET['category'];
        }
        if($_GET['tag'] && !empty($_GET['tag']))
        {
            $tag= $_GET['tag'];
        }
    ?>

<form action="<?php the_permalink(); ?>" method="get">

            <label>Category:</label>
            <select name="category">
                <option value="">ALL</option>
                <option value="men">Men</option>
                <option value="women">Women</option>              
            </select>
            <label>Tag:</label>
            <select name="tag">
                <option value="">ALL</option>
                <option value="Tag 1">Tag 1</option>
                <option value="Tag 2">Tag 2</option>                     
            </select>
            <button type="submit" name="">Filter</button>
        </form>

<?php   
                $args = array(
                    'post_type' => 'product',
                    'posts_per_page' => -1,
                    'product_cat' => $my_parent_category,
                    'tax_query' => array(
                        array(
                            'taxonomy' => 'product_cat',
                            'field' => 'slug',
                            'terms' => $category,
                            'compare' => 'LIKE',
                        ),
                        array(
                            'taxonomy' => 'product_tag',
                            'field' => 'slug',
                            'terms' => $tag,
                            'compare' => 'LIKE',
                        ),
                    ),
                );

Is there a way to say; if $category or $tag is null, display all the category and tags?
Thanks
`

• This topic was modified 4 years, 11 months ago by popcorn294.