Wordpress custom tax query with multiple conditions not working - php

Question

I have this weird functionality that is not working in wordpress.
I'm using woocomerce and I have to get some products based on some filters using the following dump code:
["tax_query"]=>
array(2) {
[0]=>
array(4) {
["taxonomy"]=>
string(11) "product_cat"
["field"]=>
string(4) "slug"
["terms"]=>
array(4) {
[0]=>
string(3) "running"
[1]=>
string(9) "hiking"
}
["operator"]=>
string(3) "AND"
}
[1]=>
array(4) {
["taxonomy"]=>
string(11) "product_cat"
["field"]=>
string(4) "slug"
["terms"]=>
array(2) {
[0]=>
string(5) "nike"
[1]=>
string(9) "adidas"
}
["operator"]=>
string(2) "OR"
}
}
For $args['tax_query'][0] I need to make AND logic. This means that the results must decrease if I select more checkboxes.
For $args['tax_query'][1] I need to make an OR logic.
The explanation for the above code is: Give me all the products that are for running but also for hiking and is produced by nike or adidas.
The following code returns 0 results. If I remove the ["operator"]=> 'AND' from $args['tax_query'][0] it will return all the results like it just pass the filter.
The final code is:
array(6) {
["posts_per_page"]=>
string(2) "12"
["post_status"]=>
string(7) "publish"
["post_type"]=>
string(7) "product"
["offset"]=>
string(1) "0"
["tax_query"]=>
array(2) {
[0]=>
array(4) {
["taxonomy"]=>
string(11) "product_cat"
["field"]=>
string(4) "slug"
["terms"]=>
array(3) {
[0]=>
string(3) "running"
[1]=>
string(9) "hiking"
}
["operator"]=>
string(3) "AND"
}
[1]=>
array(4) {
["taxonomy"]=>
string(11) "product_cat"
["field"]=>
string(4) "slug"
["terms"]=>
array(2) {
[0]=>
string(11) "nike"
[1]=>
string(34) "adidas"
}
["operator"]=>
string(2) "OR"
}
}
["meta_query"]=>
NULL
}
Any explanation or a fix for this?
Thank you.

Answer 1

You would need to use OR relation first, then AND
Modify the arguments as you need, this solution is just an idea.
Tested with POSTS
// WP_Query arguments
$args = array(
'post_type' => array( 'post' ),
'post_status' => array( 'publish' ),
'tax_query' => array(
'relation' => 'OR',
array(
'taxonomy' => 'category',
'terms' => array( 'Apple', 'Design' ),
'field' => 'name',
'operator' => 'AND',
),
array(
'relation' => 'AND',
array(
'taxonomy' => 'category',
'terms' => array('Photography', ' Android'),
'field' => 'name',
),
),
),
);
// The Query
$query = new WP_Query( $args );
foreach ($query->posts as $key => $post) {
echo '<pre>';print_r($post->post_title . ' - '. get_the_category_list(','));echo '</pre>';
}