This is an old revision of the document!

<?php

/*

HOOK FILTER IN SEARCH

*/ $post_types = [ 'post', 'page', 'dv_betriebe' ]; new SearchWithCustomFields( $post_types );

/** * * === Code Ursprung * Code basiert auf einem Beispiel von outsourcify.net * @link: https://outsourcify.net/how-to-search-in-acfs-custom-fields-in-wordpress/ * * === Original Bschreibung: * Extend WordPress search to include custom fields * @link: http://adambalee.com * */ class SearchWithCustomFields {

private $wp_filter_priority         = 100;
private $limit_search_to_post_types = []; // wp_query » post_types
private $results_per_page           = -1; // wp_query » posts_per_page

function __construct( $post_types = [ 'post', 'page' ] )
{
	$this->set_post_types( $post_types );

	add_filter( 'pre_get_posts',  [ $this, 'manipulate_wp_query' ],                    $this->wp_filter_priority );
	add_filter( 'posts_join',     [ $this, 'sql_query_join_post_and_meta_on_search' ], $this->wp_filter_priority );
	add_filter( 'posts_where',    [ $this, 'sql_query_where_replace' ],                $this->wp_filter_priority );
	add_filter( 'posts_distinct', [ $this, 'search_for_distinctive_results' ],         $this->wp_filter_priority );
	//add_filter( 'posts_results',  [ $this, '' ], $this->wp_filter_priority );
}

public function set_post_types( $post_types = [] ) { $this->limit_search_to_post_types = $post_types; }

/**
 * [manipulate_query_var description]
 *
 * @link https://developer.wordpress.org/reference/hooks/pre_get_posts/
 *
 * @param  object|wp_query   $wp_query               [description]
 * @return object|wp_query   [description]
 */
public function manipulate_wp_query( &$wp_query ) {

	if ( $this->is_search() ) {
		$wp_query->set( 'posts_per_page', $this->results_per_page );
		$wp_query->set( 'post_type', $this->limit_search_to_post_types );

		// wichtig, weil get_posts( $args ) Filter unterdrückt und es sonst nich geht
		$wp_query->set( 'suppress_filters', false );
	}

	// Return query
	return $wp_query;
}

/**
*
* Für die Post-Metas einer temporären Tabelle hinzu, damit diese auch durchsuch werden
*
* @link: http://codex.wordpress.org/Plugin_API/Filter_Reference/posts_join
*/
public function sql_query_join_post_and_meta_on_search( $join_sql_query )
{
    global $wpdb;

    if( $this->is_search() ){
        $join_sql_query .=' LEFT JOIN '.$wpdb->postmeta. ' ON '. $wpdb->posts . '.ID = ' . $wpdb->postmeta . '.post_id ';
    }

    return $join_sql_query;
}

/**
 *
 * Damit nicht nur im Title, sondern auch in einem Metafeld gesucht wird
 *
 * @link http://codex.wordpress.org/Plugin_API/Filter_Reference/posts_where
 */
public function sql_query_where_replace( $where_sql_query ) {
    global $pagenow, $wpdb;
    if ( $this->is_search() ) {
        $where_sql_query = preg_replace(
            "/\(\s*".$wpdb->posts.".post_title\s+LIKE\s*(\'[^\']+\')\s*\)/",
            "(".$wpdb->posts.".post_title LIKE $1) OR (".$wpdb->postmeta.".meta_value LIKE $1)", $where_sql_query );
    }
    return $where_sql_query;
}

/**
 * Duplikate verhindern
 *
 * @link http://codex.wordpress.org/Plugin_API/Filter_Reference/posts_distinct
 */
public function search_for_distinctive_results( $distinct_mode_string ) {

    if ( $this->is_search() ) {
        return "DISTINCT";
    }
    return $distinct_mode_string;
}

/**
 * Alias Methode von WP Funktion is_search()
 * Ist hier eine eigene Methode, falls noch mehr Bedingen hinzu kommen.
 *
 * @link: https://developer.wordpress.org/reference/functions/is_search/
 *
 * @return boolean   - true alls es sich um eine Suche handelt
 */
private function is_search()
{
	$is_search_by_wpquery    = is_search();
	$is_flatsome_ajax_search = false;

	/* Die Flatsome Theme Ajax Suche wird nicht als Suche erkannt, darum der Work Around */
	if( wp_doing_ajax() ){
		// $_REQUEST['action'] = "flatsome_ajax_search_products"
		// $_REQUEST['query'] = "Search Term Example"
		$is_flatsome_ajax_search = ( $_REQUEST['action'] === 'flatsome_ajax_search_products' ) ? true : false;;
	}

	$is_search = ( $is_flatsome_ajax_search | $is_flatsome_ajax_search ) ? true : false;

	return $is_search;
}

}