Create AJAX Gallery Filtering and Load More

Build an AJAX gallery system that loads more projects and filters them using custom taxonomies such as Type, Material, Service, and Category.

// ===================================
//  set the news more posts ajax function
// ===================================
add_action('wp_ajax_get_gallery_more_posts' , 'get_gallery_more_posts');
add_action('wp_ajax_nopriv_get_gallery_more_posts','get_gallery_more_posts');
function get_gallery_more_posts(){ 
   $total_count = 0;
   $ppp=12;

    $args = array(
          'post_status' => 'publish',
          'post_type' => 'projects',
          'posts_per_page' => $ppp,
          'order' => 'DESC',
         
      );
    if(isset($_POST['offset']) && !empty($_POST['offset'])) {
      $args['offset'] = $_POST['offset'];
    }
    $args['tax_query'] = array( 'relation'=>'AND' );
    if(isset($_POST['gallery_type']) && !empty($_POST['gallery_type'])) {
      $args['tax_query'][] = array(
              'taxonomy' => 'type',
              'field'    => 'term_taxonomy_id',
              'operator' => 'AND',
              'terms'    => explode(',',$_POST['gallery_type'])
            );
    }
    if(isset($_POST['gallery_material']) && !empty($_POST['gallery_material'])) {
      $args['tax_query'][] = array(
              'taxonomy' => 'material',
              'field'    => 'term_taxonomy_id',
              'operator' => 'AND',
              'terms'    => explode(',',$_POST['gallery_material'])
            );
    }
    if(isset($_POST['gallery_service']) && !empty($_POST['gallery_service'])) {
      $args['tax_query'][] = array(
              'taxonomy' => 'service',
              'field'    => 'term_taxonomy_id',
              'operator' => 'AND',
              'terms'    => explode(',',$_POST['gallery_service'])
            );
    }
    if(isset($_POST['gallery_category']) && !empty($_POST['gallery_category'])) {
      $args['tax_query'][] = array(
              'taxonomy' => 'categories',
              'field'    => 'term_taxonomy_id',
              'operator' => 'AND',
              'terms'    => explode(',', $_POST['gallery_category'])
            );
    }
    
  $result = array();
  $Media_query = new WP_Query($args);
  //echo '<pre>';
  //print_r($Media_query);
  $result['result'] = '';
   if( $Media_query->have_posts() ) 
      { 
        while ($Media_query->have_posts()) 
        {
          $Media_query->the_post();
          $params['post_id'] = get_the_ID();
          $result['result'] .= qrs_return_get_template_part( 'template-parts/content', 'gallery-list',$params);
        }      
      }
    wp_reset_postdata();
    
    $result['offset'] = $ppp + $_POST['offset'];
    $result['total_post'] = $Media_query->found_posts;
    $result['query'] = $Media_query->request;
    echo json_encode($result);
    exit;
}