在sql查询中附加php变量的问题

Question

我使用以下查询

SELECT  `meta_value`-0.2
FROM  `wp_postmeta` 
WHERE `meta_key` = 'latitude' 
AND `post_id` =(SELECT  wp_posts.ID 
                FROM  wp_posts 
                LEFT JOIN wp_postmeta ON wp_posts.ID = wp_postmeta.post_id
                WHERE  wp_posts.post_content LIKE  '%$searched%'
                    OR  wp_posts.post_title LIKE  '%$searched%'
                    OR  wp_posts.post_name LIKE  '%$searched%'
                    OR  wp_postmeta.meta_value LIKE '%$searched%'
                LIMIT 0 , 1 )
LIMIT  0 , 1

搜索的变量也由$ searching = the_search_query（）设置; 但是当我尝试运行查询时，搜索变量中没有任何内容