I cannot really see doing this than to run a couple of queries here, one per category. We will need to be clever here to avoid a lot of unnecessary work.
Lets look at the code; (which I will comment to ease the process of understanding)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | // Get the categories. We will only get the category ID's to speed things up $category_args = [ 'fields' => 'ids', ]; $categories = get_categories ( $category_args ); // Check if we have categories to avoid bugs if ( $categories ) { // Define the variable to hold an array of posts not to duplicate $do_not_duplicate = []; // Define a variable to hold our posts $posts_array = []; foreach ( $categories as $cat_id ) { // Setup our query arguments to get our posts $args = [ 'cat' => $cat_id, 'posts_per_page' => 1, 'post__not_in' => $do_not_duplicate, 'fields' => 'ids' // Only get post id's to increase performance ]; /** * Lets use get_posts as we do not need the whole object and get_posts by default * legally breaks pagination which makes the query faster, and it automatically * ignore sticky posts and by default does not get modified by filters */ $q = get_posts( $args ); // Check if we have posts if ( $q ) { /** * Now we need to add the post ID to the $do_not_duplicate array. * We will also pass the posts in $q to $posts_array * NOTE: you will need to rework this if you ever need more than one post per category */ $do_not_duplicate[] = $q[0]; $posts_array[] = $q[0]; } } //endforeach $categories // We can now run an instance of WP_Query to get the posts and query object if ( $posts_array ) { $final_args = [ 'posts_per_page' => count( $posts_array ), 'post__in' => $posts_array, 'ignore_sticky_posts' => 1, // Ignore stickies 'no_found_rows' => true, // Skip pagination, remove if needed ]; $final_query = new WP_Query( $final_args ); var_dump( $final_query ); // Now we can run te loop and output our posts if ( $final_query->have_posts() ) { while ( $final_query->have_posts() ) { $final_query->the_post(); the_title(); } //endwhile wp_reset_postdata(); // NEVER EVER forget this line } // endif $final_query->have_posts() } // endif $posts_array } // endif $categories |
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