厦门wordpress网站建设，厦门wordpress建站在这里教您，
WordPress删除文章时，文章里面所带的那些图片附件系统是不会自动删除，占用了网站空间，因此下面说明通过几行代码的简单方式实现在删除文章时自动删除缩略图以及图片附件，这样就不用手动去媒体库寻找并删除，准确而且效率高。
<div id="crayon-597a01bfa65e2443520689-1" class="crayon-line"><span class="crayon-c">/* 删除文章时删除图片附件</span></div>
<div id="crayon-597a01bfa65e2443520689-2" class="crayon-line"><span class="crayon-c">/* ———————— */</span></div>
<div id="crayon-597a01bfa65e2443520689-3" class="crayon-line"><span class="crayon-t">function</span> <span class="crayon-e">delete_post_and_attachments</span><span class="crayon-sy">(</span><span class="crayon-sy">$</span><span class="crayon-v">post_ID</span><span class="crayon-sy">)</span> <span class="crayon-sy">{</span></div>
<div id="crayon-597a01bfa65e2443520689-4" class="crayon-line"><span class="crayon-m">global</span> <span class="crayon-sy">$</span><span class="crayon-v">wpdb</span><span class="crayon-sy">;</span></div>
<div id="crayon-597a01bfa65e2443520689-5" class="crayon-line"><span class="crayon-c">//删除特色图片</span></div>
<div id="crayon-597a01bfa65e2443520689-6" class="crayon-line"><span class="crayon-sy">$</span><span class="crayon-v">thumbnails</span> <span class="crayon-o">=</span> <span class="crayon-sy">$</span><span class="crayon-v">wpdb</span><span class="crayon-o">-></span><span class="crayon-e">get_results</span><span class="crayon-sy">(</span> <span class="crayon-s">"SELECT * FROM $wpdb->postmeta WHERE meta_key = '_thumbnail_id' AND post_id = $post_ID"</span> <span class="crayon-sy">)</span><span class="crayon-sy">;</span><span class="crayon-h"> </span></div>
<div id="crayon-597a01bfa65e2443520689-7" class="crayon-line"><span class="crayon-st">foreach</span> <span class="crayon-sy">(</span> <span class="crayon-sy">$</span><span class="crayon-e">thumbnails </span><span class="crayon-st">as</span> <span class="crayon-sy">$</span><span class="crayon-i">thumbnail</span> <span class="crayon-sy">)</span> <span class="crayon-sy">{</span></div>
<div id="crayon-597a01bfa65e2443520689-8" class="crayon-line"><span class="crayon-h"> </span><span class="crayon-e">wp_delete_attachment</span><span class="crayon-sy">(</span> <span class="crayon-sy">$</span><span class="crayon-v">thumbnail</span><span class="crayon-o">-></span><span class="crayon-v">meta_value</span><span class="crayon-sy">,</span> <span class="crayon-t">true</span> <span class="crayon-sy">)</span><span class="crayon-sy">;</span><span class="crayon-h"> </span></div>
<div id="crayon-597a01bfa65e2443520689-9" class="crayon-line"><span class="crayon-sy">}</span></div>
<div id="crayon-597a01bfa65e2443520689-10" class="crayon-line"><span class="crayon-c">//删除图片附件</span></div>
<div id="crayon-597a01bfa65e2443520689-11" class="crayon-line"><span class="crayon-sy">$</span><span class="crayon-v">attachments</span> <span class="crayon-o">=</span> <span class="crayon-sy">$</span><span class="crayon-v">wpdb</span><span class="crayon-o">-></span><span class="crayon-e">get_results</span><span class="crayon-sy">(</span> <span class="crayon-s">"SELECT * FROM $wpdb->posts WHERE post_parent = $post_ID AND post_type = 'attachment'"</span> <span class="crayon-sy">)</span><span class="crayon-sy">;</span></div>
<div id="crayon-597a01bfa65e2443520689-12" class="crayon-line"><span class="crayon-st">foreach</span> <span class="crayon-sy">(</span> <span class="crayon-sy">$</span><span class="crayon-e">attachments </span><span class="crayon-st">as</span> <span class="crayon-sy">$</span><span class="crayon-i">attachment</span> <span class="crayon-sy">)</span> <span class="crayon-sy">{</span></div>
<div id="crayon-597a01bfa65e2443520689-13" class="crayon-line"><span class="crayon-h"> </span><span class="crayon-e">wp_delete_attachment</span><span class="crayon-sy">(</span> <span class="crayon-sy">$</span><span class="crayon-v">attachment</span><span class="crayon-o">-></span><span class="crayon-v">ID</span><span class="crayon-sy">,</span> <span class="crayon-t">true</span> <span class="crayon-sy">)</span><span class="crayon-sy">;</span><span class="crayon-h"> </span></div>
<div id="crayon-597a01bfa65e2443520689-14" class="crayon-line"><span class="crayon-sy">}</span><span class="crayon-h"> </span></div>
<div id="crayon-597a01bfa65e2443520689-15" class="crayon-line"><span class="crayon-sy">$</span><span class="crayon-v">wpdb</span><span class="crayon-o">-></span><span class="crayon-e">query</span><span class="crayon-sy">(</span> <span class="crayon-s">"DELETE FROM $wpdb->postmeta WHERE meta_key = '_thumbnail_id' AND post_id = $post_ID"</span> <span class="crayon-sy">)</span><span class="crayon-sy">;</span></div>
<div id="crayon-597a01bfa65e2443520689-16" class="crayon-line"><span class="crayon-sy">}</span></div>
<div id="crayon-597a01bfa65e2443520689-17" class="crayon-line"><span class="crayon-e">add_action</span><span class="crayon-sy">(</span><span class="crayon-s">'before_delete_post'</span><span class="crayon-sy">,</span> <span class="crayon-s">'delete_post_and_attachments'</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div>
delete_post而不是before_delete_post将导致删除文章后因媒体附件与文章关联已取消而无法正确删除。
