WordPress 10w+数据时, 解决SQL_CALC_FOUND_ROWS查询搜索使网站变慢问题

一般来讲WordPress的文章数量达到一定量级时，运行速度就会变慢。网上看到的代码，记录一下解决SQL_CALC_FOUND_ROWS查询使网站变慢问题。

<?php   /**   * Plugin Name:  WP Fast Query   * Plugin URI:   https://jiloc.com/   * Description:  WordPress 10w+数据时, 解决SQL_CALC_FOUND_ROWS查询使网站变慢问题   * Version:      1.0.0   * Author:       Leo   * Author URI:   https://jiloc.com/   * Author Email: [email protected]   * Text Domain:  wp-fast-query   * Domain Path:  /languages   * License:      GPL 2.0   * License URI:  http://www.gnu.org/licenses/gpl-2.0.html   */    if ( ! function_exists( 'jset_no_found_rows' ) ) {      /**       * 设置WP_Query的 'no_found_rows' 属性为true，禁用SQL_CALC_FOUND_ROWS       *       * @param  WP_Query $wp_query WP_Query实例       * @return void       */      function jset_no_found_rows(WP_Query $wp_query)      {          $wp_query->set('no_found_rows', true);      }  }  add_filter( 'pre_get_posts', 'jset_no_found_rows', 10, 1 );      if ( ! function_exists( 'jset_found_posts' ) ) {      /**       * 使用 EXPLAIN 方式重构       */      function jset_found_posts($clauses, WP_Query $wp_query)      {          // Don't proceed if it's a singular page.          if ($wp_query->is_singular()) {              return $clauses;          }            global $wpdb;            $where = isset($clauses['where']) ? $clauses['where'] : '';          $join = isset($clauses['join']) ? $clauses['join'] : '';          $distinct = isset($clauses['distinct']) ? $clauses['distinct'] : '';            $wp_query->found_posts = (int)$wpdb->get_row("EXPLAIN SELECT $distinct * FROM {$wpdb->posts} $join WHERE 1=1 $where")->rows;            $posts_per_page = (!empty($wp_query->query_vars['posts_per_page']) ? absint($wp_query->query_vars['posts_per_page']) : absint(get_option('posts_per_page')));            $wp_query->max_num_pages = ceil($wp_query->found_posts / $posts_per_page);            return $clauses;      }  }  add_filter( 'posts_clauses', 'jset_found_posts', 10, 2 );

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