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WordPress: Custom post filters for Search

If you want to customize the query when doing a search in WordPress – when meta_queries are not enough.

The custom “WHERE” part of the query

function custom_where($where,$query) {
  global $wpdb;
  $new_where = " /*my new where*/ $wpdb->postmeta.meta_value LIKE '%".get_search_query()."%'";
  if (empty($where))
    $where = $new_where;
    $where = "{$where} /*OR*/  OR {$new_where}";
  return $where;

The “DISTINCT” part

function search_distinct() {
  return "DISTINCT";

The custom “JOIN”

function custom_join($join) {
  global $wp_query, $wpdb;
  $join .= "INNER JOIN $wpdb->postmeta ON $wpdb->posts.ID = $wpdb->postmeta.post_id ";
  return $join;

Putting them all up for the “pre_get_posts”

function filter_search($query) {
    if ($query->is_search) {
      $query->set('post_type', array('post', 'recipes'));
      add_filter('posts_join', 'custom_join');
      add_filter('posts_distinct', 'search_distinct');
    return $query;
add_filter('pre_get_posts', 'filter_search');
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