Custom Search and Category Widgets WordPress

Custom Search and Category Widgets WordPress

/* 
WEBSITE : http://www.oldstructures.com/tag/projects/ 
*/


/* customer search form for widgets azizultex */
add_filter('widget_text','do_shortcode');

/* search form shortcode that populate tag automatically by tag page */
function searchFormByTag() { 
  $tag = get_queried_object();
  $placeholderTxt = (is_search()) ? get_search_query() : 'Enter keywords';
  return '<form action="'.get_bloginfo('url').'" method="get">
      <input type="text" name="s" placeholder="'.$placeholderTxt.'" />
      <input type="hidden" name="filter_tag" value="'.$tag->slug.'" />
  </form>';
}
add_shortcode('searchbytag', 'searchFormByTag');

/* filter search by tag */
function searchfilter($query) {
  if ($query->is_search && !is_admin() ) {
      $query->set('tag', $_GET['filter_tag']);
  }
  return $query;
}

add_filter('pre_get_posts','searchfilter');

/* filter category acchieve page posts by filter_tag */
function filterCategoryPosts($query) {
  if ($query->is_category && !is_admin() ) {
      $query->set('tag', $_GET['filter_tag']);
  }
  return $query;
}
add_filter('pre_get_posts','filterCategoryPosts');


/* find posts numbers by specific cat and tag */
function catTagMatchedPosts($cat, $tag) {
  $args = array(
    'cat' => $cat,
    'tag' => $tag,
    'posts_per_page' => -1
  );
  $posts = query_posts( $args );
  return count($posts);
}

/* category shortcode get categories have posts with the tags only */
function categoriesbytags_func() {
  $tag = get_queried_object();
  $args = array(
    'tag' => $tag->slug,
    'posts_per_page' => -1
  );

  $posts = query_posts($args);

  $ids = wp_list_pluck($posts, 'ID');

  $output = '';
  $cat_ids = array();

  foreach ($ids as $id) {
    $post_categories = wp_get_post_categories( $id ); // get categories of the post
    foreach($post_categories as $c){ // loop through all categories of that post
      $cat = get_category( $c );
      $cat_ids[] = $cat->term_id;
    }
  }

  $unique_ids = array_unique($cat_ids); // remove duplicate categories 
  
  foreach ($unique_ids as $uid ) { // loop through all category ids
    $cat = get_category( $uid ); // get category object
    $cat_link = get_category_link($cat->term_id);
    $cat_tag_link = esc_url(add_query_arg( 'filter_tag', $tag->slug, $cat_link )); // tag slug to category link to make it possible to filter only matched posts 
    $output .= '<ul>';
      $output .= '<li><a href="'.$cat_tag_link.'">'.$cat->name.'</a> ('.catTagMatchedPosts($cat->term_id, $tag->slug).')</li>';
    $output .= '</ul>';
  }

  return $output;

}

add_shortcode('categoriesbytags', 'categoriesbytags_func');