Reply To: Sort by post category and then by date

• pedrosaclout

• February 19, 2024 at 6:59 am

Great, thanks!
This is how it was solved.

<?php
$allPosts = new WP_Query(array(
    'posts_per_page' => -1,
    'post_type' => 'intervention',
    'orderby' => 'meta_value',
    'meta_key' => 'publication_category',
    'order' => 'ASC'
));

// Get the posts
$posts = $allPosts->posts;

// Define custom sorting function
function custom_sort($a, $b) {
    // First, compare by publication category
    $categoryA = strtolower(get_post_meta($a->ID, 'publication_category', true));
    $categoryB = strtolower(get_post_meta($b->ID, 'publication_category', true));

    // Compare categories alphabetically
    $categoryComparison = strcmp($categoryA, $categoryB);

    // If categories are the same, compare by publication year
    if ($categoryComparison == 0) {
        $yearA = intval(get_post_meta($a->ID, 'year', true));
        $yearB = intval(get_post_meta($b->ID, 'year', true));
        return $yearB - $yearA;
    }

    return $categoryComparison;
}

// Sort the posts array using the custom sorting function
usort($posts, 'custom_sort');

foreach ($posts as $post) {
    setup_postdata($post);

   //Display posts ordered by category and inside categories organise by dates
    
    // Reset post data
    wp_reset_postdata();
    ?>