Thanks, John, but I have to adapt this to my code to fully understand it:
I have a range of jewellery (using a Custom Post Type = jewellery) that I separate by Category (using the built in Categories of WP) and Brands (using a custom field to select the brand in the custom post type).
From that I create two separate drop downs: Category with values of IDs of categories, and Brands with values of strings.
So if the user select a Brand from one of the selects and a Category from the other select, the code you provide should look like this, right:
'post_type' => 'jewellery', 'tax_query' => array( array( 'taxonomy' => 'category', 'terms' => array( $category ) // <-- THIS I GET FROM $_GET['c'] ) ), 'meta_query' => array( array( 'key' => 'select_brand', // <-- WHAT DO I PUT HERE (THE CUSTOM FIELD VALUE, this is what I named it.) 'value' => $brand // <-- THIS I GET FROM $_GET['b'] ) )
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