functions.php

## ajax load more
    add_action('wp_ajax_load_more_projects', 'load_more_projects');
    add_action('wp_ajax_nopriv_load_more_projects', 'load_more_projects');
    function load_more_projects() {
        $ajaxposts = new WP_Query([
          'post_type' => 'post',
          'posts_per_page' => 1,
          'orderby' => 'data',
          'order' => 'desc',
          'category_name' => $_POST['category'],
          'paged' => $_POST['paged'],
        ]);

        $response = '';
        $max_pages = $ajaxposts->max_num_pages;

        if($ajaxposts->have_posts()) {
            ob_start();
            while($ajaxposts->have_posts()) {
                $ajaxposts->the_post();
                $response .= get_template_part('construction_parts/project-card');
            }
            $output = ob_get_contents();
            ob_end_clean();
        } else {
          $response = '';
        }

        $result = [
            'max' => $max_pages,
            'html' => $output,
          ];

        echo json_encode($result);
        exit;
      }

    ## ajax filter
    add_action('wp_ajax_filter_projects', 'filter_projects');
    add_action('wp_ajax_nopriv_filter_projects', 'filter_projects');
    function filter_projects() {
        $ajaxposts = new WP_Query([
          'post_type' => 'post',
          'posts_per_page' => 1,
          'orderby' => 'data',
          'order' => 'desc',
          'category_name' =>  $_POST['category'],
          'paged' => $_POST['paged'],
        ]);

        $response = '';
        $max_pages = $ajaxposts->max_num_pages;

        if($ajaxposts->have_posts()) {
            ob_start();
            while($ajaxposts->have_posts()) {
                $ajaxposts->the_post();
                $response .= get_template_part('construction_parts/project-card');
            }
            $output = ob_get_contents();
            ob_end_clean();
        } else {
          $response = '';
        }

        $result = [
            'max' => $max_pages,
            'html' => $output,
          ];

        echo json_encode($result);
        exit;
      }