很多朋友在使用 WordPress 时会觉得默认的搜索搜出来的结果不太精准,WordPress 默认会将标题和文章描述中含有关键词的文章都检索出来,这样一来许多标题中不含关键词的文章被搜索出来,用户体验不是很好,解决这个问题的办法就是将默认的搜索改为只搜索标题。这篇文章就来实现这个需求。
而很多网上给出的文章中,都是让在主题的 functions.php 文件中加上这样一段代码
/**
* 让 WordPress 只搜索文章的标题
* https://www.wpdaxue.com/search-by-title-only.html
*/
function __search_by_title_only( $search, &$wp_query )
{
global $wpdb;
if ( empty( $search ) )
return $search; // skip processing - no search term in query
$q = $wp_query->query_vars;
$n = ! empty( $q['exact'] ) ? '' : '%';
$search =
$searchand = '';
foreach ( (array) $q['search_terms'] as $term ) {
$term = esc_sql( like_escape( $term ) );
$search .= "{$searchand}($wpdb->posts.post_title LIKE '{$n}{$term}{$n}')";
$searchand = ' AND ';
}
if ( ! empty( $search ) ) {
$search = " AND ({$search}) ";
if ( ! is_user_logged_in() )
$search .= " AND ($wpdb->posts.post_password = '') ";
}
return $search;
}
add_filter( 'posts_search', '__search_by_title_only', 500, 2 );
而加上这段代码之后,WordPress会报出这样一句警告:”Parameter 2 to __search_by_title_only() expected to be a reference, value given in...“,意思是第 2 个参数期待的是一个引用,而实际传过来的是一个值。
所以将 &$wp_query
修改为 $wp_query 即可。
即
/**
* 让 WordPress 只搜索文章的标题
* https://www.wpdaxue.com/search-by-title-only.html
*/
function __search_by_title_only( $search, $wp_query )
{
global $wpdb;
if ( empty( $search ) )
return $search; // skip processing - no search term in query
$q = $wp_query->query_vars;
$n = ! empty( $q['exact'] ) ? '' : '%';
$search =
$searchand = '';
foreach ( (array) $q['search_terms'] as $term ) {
$term = esc_sql( like_escape( $term ) );
$search .= "{$searchand}($wpdb->posts.post_title LIKE '{$n}{$term}{$n}')";
$searchand = ' AND ';
}
if ( ! empty( $search ) ) {
$search = " AND ({$search}) ";
if ( ! is_user_logged_in() )
$search .= " AND ($wpdb->posts.post_password = '') ";
}
return $search;
}
add_filter( 'posts_search', '__search_by_title_only', 500, 2 );
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