建站教程 2022-08-21

WordPress文章过多导致网站慢卡顿优化方法

当我们使用WordPress作为程序时，如果WordPress网站的文章数量超过10万，即使网站服务器的配置很强大，网站的打开速度基本上也会很慢。这时我们就需要对网站进行优化。

这是因为 WordPress 在查询文章列表时，默认也会查询文章数。这对于少量的网站数据应该不会造成任何问题，但是对于大量的文章是不可避免的。慢查询。主机引用的一位用户告诉我们，他的网站有40万篇文章，打开首页需要一两分钟，甚至首页或文章页也经常打不开。

WordPress网站查询慢的原因：WordPress在查询帖子列表时，默认也会查询帖子数。使用此方法：get_posts、query_posts 和 WP_Query。get_posts在4.6.1+中没有使用SQL_CALC_FOUND_ROWS，但是query_posts和WP_Query仍然使用，所以需要优化。

那么如何解决WordPress文章过多导致网站慢的问题呢？

方法一：完全禁用SQL_CALC_FOUND_ROWS，将以下的代码放到functions.php文件中：

<div class="codecolorer-container php geshi" style="overflow:auto;white-space:nowrap;width:100%;"><div class="php codecolorer" style="white-space:nowrap">add_action<span style="color: #009900;">(</span><span style="color: #0000ff;">'pre_get_posts'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'wndt_post_filter'</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span><br><span style="color: #000000; font-weight: bold;">function</span> wndt_post_filter<span style="color: #009900;">(</span><span style="color: #000088;">$query</span><span style="color: #009900;">)</span> <span style="color: #009900;">{</span><br><span style="color: #b1b100;">if</span> <span style="color: #009900;">(</span>is_admin<span style="color: #009900;">(</span><span style="color: #009900;">)</span> or <span style="color: #339933;">!</span><span style="color: #000088;">$query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">is_main_query</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span> <span style="color: #009900;">{</span><br><span style="color: #b1b100;">return</span> <span style="color: #000088;">$query</span><span style="color: #339933;">;</span><br><span style="color: #009900;">}</span><br><br><span style="color: #666666; font-style: italic;">// 禁止查询 SQL_CALC_FOUND_ROWS</span><br><span style="color: #000088;">$query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">set</span><span style="color: #009900;">(</span><span style="color: #0000ff;">'no_found_rows'</span><span style="color: #339933;">,</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span><br><span style="color: #009900;">}</span></div></div>

<div class="codecolorer-container php geshi" style="overflow:auto;white-space:nowrap;width:100%;"><div class="php codecolorer" style="white-space:nowrap">add_action('pre_get_posts', 'wndt_post_filter'); function wndt_post_filter($query) { if (is_admin() or !$query->is_main_query()) { return $query; } // 禁止查询 SQL_CALC_FOUND_ROWS $query->set('no_found_rows', true); }</div></div>

方法二、如果您还需要查询文章数，请使用更高效的EXPLAIN方法代替SQL_CALC_FOUND_ROWS，以更高效的方式禁用SQL_CALC_FOUND_ROWS。这里我们使用 EXPLAIN 方法。

具体代码如下，将以下的代码放在functions.php文件中。

<div class="codecolorer-container php geshi" style="overflow:auto;white-space:nowrap;width:100%;"><div class="php codecolorer" style="white-space:nowrap"><span style="color: #b1b100;">if</span> <span style="color: #009900;">(</span> <span style="color: #339933;">!</span> <span style="color: #990000;">function_exists</span><span style="color: #009900;">(</span> <span style="color: #0000ff;">'zjck_set_no_found_rows'</span> <span style="color: #009900;">)</span> <span style="color: #009900;">)</span> <span style="color: #009900;">{</span><br><span style="color: #009933; font-style: italic;">/**<br>
* 设置WP_Query的 'no_found_rows' 属性为true，禁用SQL_CALC_FOUND_ROWS<br>
*<br>
* @param WP_Query $wp_query WP_Query实例<br>
* @return void<br>
*/</span><br><span style="color: #000000; font-weight: bold;">function</span> zjck_set_no_found_rows<span style="color: #009900;">(</span>WP_Query <span style="color: #000088;">$wp_query</span><span style="color: #009900;">)</span><br><span style="color: #009900;">{</span><br><span style="color: #000088;">$wp_query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">set</span><span style="color: #009900;">(</span><span style="color: #0000ff;">'no_found_rows'</span><span style="color: #339933;">,</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span><br><span style="color: #009900;">}</span><br><span style="color: #009900;">}</span><br>
add_filter<span style="color: #009900;">(</span> <span style="color: #0000ff;">'pre_get_posts'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'zjck_set_no_found_rows'</span><span style="color: #339933;">,</span> <span style="color: #cc66cc;">10</span><span style="color: #339933;">,</span> <span style="color: #cc66cc;">1</span> <span style="color: #009900;">)</span><span style="color: #339933;">;</span><br><br><span style="color: #b1b100;">if</span> <span style="color: #009900;">(</span> <span style="color: #339933;">!</span> <span style="color: #990000;">function_exists</span><span style="color: #009900;">(</span> <span style="color: #0000ff;">'zjck_set_found_posts'</span> <span style="color: #009900;">)</span> <span style="color: #009900;">)</span> <span style="color: #009900;">{</span><br><span style="color: #009933; font-style: italic;">/**<br>
* 使用 EXPLAIN 方式重构<br>
*/</span><br><span style="color: #000000; font-weight: bold;">function</span> zjck_set_found_posts<span style="color: #009900;">(</span><span style="color: #000088;">$clauses</span><span style="color: #339933;">,</span> WP_Query <span style="color: #000088;">$wp_query</span><span style="color: #009900;">)</span><br><span style="color: #009900;">{</span><br><span style="color: #666666; font-style: italic;">// Don't proceed if it's a singular page.</span><br><span style="color: #b1b100;">if</span> <span style="color: #009900;">(</span><span style="color: #000088;">$wp_query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">is_singular</span><span style="color: #009900;">(</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span> <span style="color: #009900;">{</span><br><span style="color: #b1b100;">return</span> <span style="color: #000088;">$clauses</span><span style="color: #339933;">;</span><br><span style="color: #009900;">}</span><br><br><span style="color: #000000; font-weight: bold;">global</span> <span style="color: #000088;">$wpdb</span><span style="color: #339933;">;</span><br><br><span style="color: #000088;">$where</span> <span style="color: #339933;">=</span> <span style="color: #990000;">isset</span><span style="color: #009900;">(</span><span style="color: #000088;">$clauses</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'where'</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span> ? <span style="color: #000088;">$clauses</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'where'</span><span style="color: #009900;">]</span> <span style="color: #339933;">:</span> <span style="color: #0000ff;">''</span><span style="color: #339933;">;</span><br><span style="color: #000088;">$join</span> <span style="color: #339933;">=</span> <span style="color: #990000;">isset</span><span style="color: #009900;">(</span><span style="color: #000088;">$clauses</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'join'</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span> ? <span style="color: #000088;">$clauses</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'join'</span><span style="color: #009900;">]</span> <span style="color: #339933;">:</span> <span style="color: #0000ff;">''</span><span style="color: #339933;">;</span><br><span style="color: #000088;">$distinct</span> <span style="color: #339933;">=</span> <span style="color: #990000;">isset</span><span style="color: #009900;">(</span><span style="color: #000088;">$clauses</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'distinct'</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span> ? <span style="color: #000088;">$clauses</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'distinct'</span><span style="color: #009900;">]</span> <span style="color: #339933;">:</span> <span style="color: #0000ff;">''</span><span style="color: #339933;">;</span><br><br><span style="color: #000088;">$wp_query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">found_posts</span> <span style="color: #339933;">=</span> <span style="color: #009900;">(</span>int<span style="color: #009900;">)</span><span style="color: #000088;">$wpdb</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">get_row</span><span style="color: #009900;">(</span><span style="color: #0000ff;">"EXPLAIN SELECT <span style="color: #006699; font-weight: bold;">$distinct</span> * FROM <span style="color: #006699; font-weight: bold;">{$wpdb-&gt;posts}</span> <span style="color: #006699; font-weight: bold;">$join</span> WHERE 1=1 <span style="color: #006699; font-weight: bold;">$where</span>"</span><span style="color: #009900;">)</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">rows</span><span style="color: #339933;">;</span><br><br><span style="color: #000088;">$posts_per_page</span> <span style="color: #339933;">=</span> <span style="color: #009900;">(</span><span style="color: #339933;">!</span><span style="color: #990000;">empty</span><span style="color: #009900;">(</span><span style="color: #000088;">$wp_query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">query_vars</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'posts_per_page'</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span> ? absint<span style="color: #009900;">(</span><span style="color: #000088;">$wp_query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">query_vars</span><span style="color: #009900;">[</span><span style="color: #0000ff;">'posts_per_page'</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span> <span style="color: #339933;">:</span> absint<span style="color: #009900;">(</span>get_option<span style="color: #009900;">(</span><span style="color: #0000ff;">'posts_per_page'</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span><br><br><span style="color: #000088;">$wp_query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">max_num_pages</span> <span style="color: #339933;">=</span> <span style="color: #990000;">ceil</span><span style="color: #009900;">(</span><span style="color: #000088;">$wp_query</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">found_posts</span> <span style="color: #339933;">/</span> <span style="color: #000088;">$posts_per_page</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span><br><br><span style="color: #b1b100;">return</span> <span style="color: #000088;">$clauses</span><span style="color: #339933;">;</span><br><span style="color: #009900;">}</span><br><span style="color: #009900;">}</span><br>
add_filter<span style="color: #009900;">(</span> <span style="color: #0000ff;">'posts_clauses'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'zjck_set_found_posts'</span><span style="color: #339933;">,</span> <span style="color: #cc66cc;">10</span><span style="color: #339933;">,</span> <span style="color: #cc66cc;">2</span> <span style="color: #009900;">)</span><span style="color: #339933;">;</span></div></div>

<div class="codecolorer-container php geshi" style="overflow:auto;white-space:nowrap;width:100%;"><div class="php codecolorer" style="white-space:nowrap">if ( ! function_exists( 'zjck_set_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 zjck_set_no_found_rows(WP_Query $wp_query) { $wp_query->set('no_found_rows', true); } }

add_filter( 'pre_get_posts', 'zjck_set_no_found_rows', 10, 1 ); if ( ! function_exists( 'zjck_set_found_posts' ) ) { /**

* 使用 EXPLAIN 方式重构

*/ function zjck_set_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', 'zjck_set_found_posts', 10, 2 );</div></div>

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