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Using a pre_get_posts filter to search a given string on all meta_values:

$query->set('meta_value', 'first string');

debug:

AND ( (CAST(wp_postmeta.meta_value AS CHAR) = 'first string') )

Works Ok :) but how can I search on all meta_values for an array of strings?

For example. I need something like:

$query->set('meta_value', array('first string', 'second string'));

AND ( (CAST(wp_postmeta.meta_value AS CHAR) = 'first string') OR (CAST(wp_postmeta.meta_value AS CHAR) = 'second string') )

It is possible using $query->set('meta_value'... or something else?

Thanks in advance!

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1 Answer

up vote 0 down vote accepted

Yes, I got it:

function custom_search_where( $where = '' ) {

    global $wpdb;

    if ( is_search() ) {

        if ( isset($_GET['my-terms']) ) {

            $count = count($_GET['my-terms']);

            if ( $count > 0 ) {

                foreach ( $_GET['my-terms'] as $term ) {

                    // http://codex.wordpress.org/Class_Reference/wpdb

                    $title      = $wpdb->prefix . "posts.post_title";
                    $content    = $wpdb->prefix . "posts.post_content";
                    $meta_value = $wpdb->prefix . "postmeta.meta_value";

                    $term       = trim($term);
                    $my_term    = $wpdb->escape($term);

                    $where .= " AND (($title LIKE '%$my_term%') OR ($content LIKE '%$my_term%') OR (CAST($meta_value AS CHAR) = '$my_term')) ";      

                }

            }

        }

    }

    return $where;

}


add_filter('posts_where', 'custom_search_where', 999);

and:

function custom_search_join ($join) {

    global $wpdb;

    if( is_search() ) {

        $existCustomTerms = false;

        if ( isset($_GET['my-terms']) ) {

            $count = count($_GET['my-terms']);

            if ( $count > 0 ) {

                $join .= "INNER JOIN $table ON ($postID = $postmetaID)";

            }

        }

    }

    return $join;

}


add_filter('posts_join', 'custom_search_join' );
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