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Let’s say you have two main categories for your posts:

  • Europe
  • Asia

And posts from these main categories also have one or more of the same additional categories.

  • Europe
    • Flights
    • Hotels
    • Dining
  • Asia
    • Flights
    • Hotels
    • Dining

Now lets say you only want to include posts that have “Europe” as a category, but also only want to include “Europe” posts with either “Flights” or “Hotels”, and NOT “Dining”.

So the logic would be:
(Europe AND Flights) OR (Europe AND Hotels)
This can be accomplished by hooking into one of the plugin’s PHP filters.

1. For the above scenario, choose "Europe", "Flights" and "Hotels" as your Categories, and then choose "OR" for the Category Relation.

2. Next, add the following PHP code to your theme's "functions.php" file.

In the following code, the number “121” is the Category ID for “Europe”.  Adjust this number accordingly.

add_filter('essgrid_modify_posts', 'eg_modify_post', 10, 2);
 
function eg_modify_post($posts, $grid_id){
 
    $filterPosts = array();
 
    foreach($posts as $post) {
 
        foreach($post['post_category'] as $cat) {
 
            // where "121" is the Category ID or "Europe"
            if($cat === 121) {
 
                $filterPosts[] = $post;
                break;
 
            }
 
        }
 
    }
 
    return $filterPosts;
 
}

Variation of above code for WooCommerce Product Categories.

add_filter('essgrid_modify_posts', 'eg_modify_post', 10, 2);
 
function eg_modify_post($posts, $grid_id) {
 
    $filterPosts = array();
 
    foreach($posts as $post) {
 
        $cats = get_the_terms($post['ID'], 'product_cat');
 
        foreach($cats as $cat) {
 
            // where "121" is the Category ID or "Europe"
            if($cat->term_id === 121) {
 
                $filterPosts[] = $post;
                break;
 
            }
 
        }
 
    }
 
    return $filterPosts;
 
}

Variation to include Sub Categories

add_filter('essgrid_modify_posts', 'eg_modify_post', 10, 2);
 
function eg_modify_post($posts, $grid_id){
 
    $filterPosts = array();
    foreach($posts as $post) {
 
        $cats = $post['post_category'];
        foreach($cats as $cat) {
 
            // parent-category ID is "25" or "26"
            if($cat === 25 || $cat === 26) {
 
                $subs = get_categories(array('child_of' => $cat));
 
                foreach($subs as $sub) {
 
                    $id = $sub -> cat_ID;
                    if(in_array($id, $cats)) {
 
                        // sub-category ID is "27" or "28"
                        if($id === 27 || $id === 28) {
 
                            $filterPosts[] = $post;
 
                        }    
                    }    
                }
            }
        }
    }
 
    return $filterPosts;
 
}

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