如何在没有插件的情况下按不同的字段搜索WordPress？

我正在构建自己的WordPress主题，我希望我的搜索查询能够通过标题、类别、标签和内容中的关键字来搜索帖子。到目前为止，我相信我的主题只是通过标题和内容中的关键字进行搜索。

如何确定当前正在搜索哪些字段？一旦我确定了这一点，我该如何修改我的搜索查询，以便它按上面列出的字段搜索帖子？

我尝试了类似于下面教程的内容。如果看到我主题中的代码可以帮助您回答，请告诉我您需要什么文件，我会发布它们。

<?php
/**
 * Extend WordPress search to include custom fields
 *
 * https://adambalee.com
 */

/**
 * Join posts and postmeta tables
 *
 * http://codex.wordpress.org/Plugin_API/Filter_Reference/posts_join
 */
function cf_search_join( $join ) {
    global $wpdb;

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

    return $join;
}
add_filter(\'posts_join\', \'cf_search_join\' );

/**
 * Modify the search query with posts_where
 *
 * http://codex.wordpress.org/Plugin_API/Filter_Reference/posts_where
 */
function cf_search_where( $where ) {
    global $pagenow, $wpdb;

    if ( is_search() ) {
        $where = preg_replace(
            "/\\(\\s*".$wpdb->posts.".post_title\\s+LIKE\\s*(\\\'[^\\\']+\\\')\\s*\\)/",
            "(".$wpdb->posts.".post_title LIKE $1) OR (".$wpdb->postmeta.".meta_value LIKE $1)", $where );
    }

    return $where;
}
add_filter( \'posts_where\', \'cf_search_where\' );

/**
 * Prevent duplicates
 *
 * http://codex.wordpress.org/Plugin_API/Filter_Reference/posts_distinct
 */
function cf_search_distinct( $where ) {
    global $wpdb;

    if ( is_search() ) {
        return "DISTINCT";
    }

    return $where;
}
add_filter( \'posts_distinct\', \'cf_search_distinct\' );

add_filter( \'posts_join\', \'search_join\', 10, 2 ); /** * Joins the terms, term_relationship, and term_taxonomy tables. * * @global $wpdb * * @param string $join The sql JOIN clause. * @param object $query The current WP_Query instance. * * @return string $join */ function search_join( $join, $query ) { global $wpdb; if ( is_main_query() && is_search() ) { $join .= " LEFT JOIN ( {$wpdb->term_relationships} INNER JOIN {$wpdb->term_taxonomy} ON {$wpdb->term_taxonomy}.term_taxonomy_id = {$wpdb->term_relationships}.term_taxonomy_id INNER JOIN {$wpdb->terms} ON {$wpdb->terms}.term_id = {$wpdb->term_taxonomy}.term_id ) ON {$wpdb->posts}.ID = {$wpdb->term_relationships}.object_id "; } return $join; } add_filter( \'posts_where\', \'custom_posts_where\', 10, 2 ); /** * Callback for WordPress \'posts_where\' filter. * * Modify the where clause to include searches against a WordPress taxonomy. * * @global $wpdb * * @param string $where The where clause. * @param WP_Query $query The current WP_Query. * * @return string The where clause. */ function custom_posts_where( $where, $query ) { global $wpdb; if ( is_main_query() && is_search() ) { // get additional where clause for the user $user_where = custom_get_user_posts_where(); $where .= " OR ( {$wpdb->term_taxonomy}.taxonomy IN( \'category\', \'post_tag\' ) AND {$wpdb->terms}.name LIKE \'%" . esc_sql( get_query_var( \'s\' ) ) . "%\' {$user_where} )"; } return $where; } function custom_get_user_posts_where() { global $wpdb; $user_id = get_current_user_id(); $sql = \'\'; $status = array( "\'publish\'" ); if ( $user_id ) { $status[] = "\'private\'"; $sql .= " AND {$wpdb->posts}.post_author = {$user_id}"; } $sql .= " AND {$wpdb->posts}.post_status IN( " . implode( \',\', $status ) . " ) "; return $sql; } add_filter( \'posts_groupby\', \'custom_posts_groupby\', 10, 2 ); /** * Callback for WordPress \'posts_groupby\' filter. * * Set the GROUP BY clause to post IDs. * * @global $wpdb * * @param string $groupby The GROUPBY caluse. * @param WP_Query $query The current WP_Query object. * * @return string The GROUPBY clause. */ function custom_posts_groupby( $groupby, $query ) { global $wpdb; if ( is_main_query() && is_search() ) { $groupby = "{$wpdb->posts}.ID"; } return $groupby; }

小码农CODE

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