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Include posts from Co-Authors Plus Guest Authors in Wordpress' search results
<?php defined('ABSPATH') or die();
* Include posts from guest authors in the search results.
* @author jakebellacera
add_filter('posts_clauses', 'search_posts_clauses', 10, 2);
function search_posts_clauses($clauses, $query) {
if (!$query->is_main_query && !$query->is_search && !$query->is_admin)
return $clauses;
global $wpdb;
$clauses['join'] .= <<<SQL
INNER JOIN {$wpdb->term_relationships} ON {$wpdb->posts}.ID = {$wpdb->term_relationships}.object_id
INNER JOIN {$wpdb->term_taxonomy} USING (term_taxonomy_id)
INNER JOIN {$wpdb->terms} USING (term_id)
$clauses['where'] .= $wpdb->prepare(
" OR ({$wpdb->term_taxonomy}.taxonomy = 'author' AND {$wpdb->term_taxonomy}.description LIKE '%%%s%%' AND {$wpdb->posts}.post_type = 'post'",
return $clauses;

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@danielkg danielkg commented Jul 19, 2018

You're missing the closing parenthesis in the where statement at the end:

" OR ({$wpdb->term_taxonomy}.taxonomy = 'author' AND {$wpdb->term_taxonomy}.description LIKE '%%%s%%' AND {$wpdb->posts}.post_type = 'post')",
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