WordPress要实现文章多重筛选的核心函数就是wp_query( )，有php基础的，直接看官方文档应该就能解决标题所提到的WordPress多重筛选功能了。效果图实例：
下面我做一些简单的介绍:
假设文章有自定义字段：area 存放的是地区信息，比如重庆，比如北京等。另一个字段为type，存放的是比如，
<span class="token comment">// 分类</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'cat'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token variable">$cat_name</span><span class="token operator">=</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'cat'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 标签</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'tag'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token variable">$tag</span><span class="token operator">=</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'tag'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 自定义字段：area</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'area'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token variable">$array_temp</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'key'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token single-quoted-string string">'area'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'value'</span><span class="token operator">=</span><span class="token operator">></span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'area'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'compare'</span><span class="token operator">=</span><span class="token operator">></span><span class="token single-quoted-string string">'='</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">array_push</span><span class="token punctuation">(</span><span class="token variable">$metaArray</span><span class="token punctuation">,</span><span class="token variable">$array_temp</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// 自定义字段：type</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token variable">$array_temp</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'key'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token single-quoted-string string">'type'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'value'</span><span class="token operator">=</span><span class="token operator">></span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'type'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'compare'</span><span class="token operator">=</span><span class="token operator">></span><span class="token single-quoted-string string">'='</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">array_push</span><span class="token punctuation">(</span><span class="token variable">$metaArray</span><span class="token punctuation">,</span><span class="token variable">$array_temp</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">//正反顺序</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'order'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token variable">$order</span><span class="token operator">=</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'order'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">else</span> <span class="token variable">$order</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'DESC'</span><span class="token punctuation">;</span>
<span class="token comment">//默认按时间排序</span>
<span class="token variable">$orderby</span><span class="token operator">=</span><span class="token single-quoted-string string">'date'</span><span class="token punctuation">;</span>
<span class="token comment">//如果用户设置了按文章特定字段价排序</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'orderby'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'orderby'</span><span class="token punctuation">]</span> <span class="token operator">==</span> <span class="token single-quoted-string string">'views'</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token variable">$array_temp</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'key'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token single-quoted-string string">'views'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">array_push</span><span class="token punctuation">(</span><span class="token variable">$metaArray</span><span class="token punctuation">,</span><span class="token variable">$array_temp</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$orderby</span><span class="token operator">=</span><span class="token single-quoted-string string">'meta_value_num'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">else</span> <span class="token variable">$orderby</span> <span class="token operator">=</span> <span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'orderby'</span><span class="token punctuation">]</span><span class="token punctuation">;</span> <span class="token comment">//否则按wp自带排序字段</span>
<span class="token punctuation">}</span>
<span class="token comment">//获取上述参数，组成查询条件</span>
<span class="token variable">$args</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span>
<span class="token single-quoted-string string">'meta_query'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token variable">$metaArray</span><span class="token punctuation">,</span>
<span class="token single-quoted-string string">'category_name'</span> <span class="token operator">=</span> <span class="token operator">></span><span class="token variable">$cat_name</span><span class="token punctuation">,</span>
<span class="token single-quoted-string string">'tag'</span><span class="token operator">=</span> <span class="token variable">$tag_name</span><span class="token punctuation">,</span>
<span class="token single-quoted-string string">'order'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token variable">$order</span><span class="token punctuation">,</span><span class="token comment">//DESC,</span>
<span class="token single-quoted-string string">'orderby'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token variable">$orderby</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//查询文章</span>
<span class="token variable">$query</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">WP_Query</span><span class="token punctuation">(</span> <span class="token variable">$args</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>
输出：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token variable">$query</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">have_posts</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token variable">$query</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">the_post</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>
<span class="token tag"><span class="token punctuation"><</span>h1<span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>post-name<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token punctuation"><</span>a<span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token function">the_permalink</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token function">the_title</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span><span class="token tag"><span class="token punctuation"></</span>a<span class="token punctuation">></span></span><span class="token tag"><span class="token punctuation"></</span>h1<span class="token punctuation">></span></span>
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">endwhile</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>我这里只设置输出了标题。大意就是如此。通过上面的代码，就可以实现，标签，分类，和area 和type四个条件的多重筛选。
<span class="token global">$_GET</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'cat'</span><span class="token punctuation">]</span><span class="token punctuation">)</span> 这是指从网址中获取的值，比如 ?area=重庆&cat=food&tag=good&type=xxx&orderby=modified 则获取的是，重庆地区，分类为food，标签为good，类型为xxxx的文章，并按修改时间排序。
为了方便通过点击自动生成上述链接，你可能需要了解一下：add_query_arg() 和 remove_query_arg() 这两个函数。如果多重筛选需要分页，你可能需要 WP-PageNavi这个插件配合上面的代码使用
<span class="token function">wp_pagenavi</span><span class="token punctuation">(</span> <span class="token keyword">array</span><span class="token punctuation">(</span> <span class="token single-quoted-string string">'query'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token variable">$query</span> <span class="token punctuation">)</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>上述方法是WordPress实现多重筛选最优质的思路，网上其他有一些方法，比如通过多个tag等实现，但如果遇到需要自定义字段的区间筛选就歇菜了。
非常抱歉，你可能读完这篇文章还是云里雾里，实话说，如果你毫无编程基础，的确很难理解。我这里只是记录的一个实现思路。但一旦你熟悉就会豁然开朗，WordPress多重筛选真的很好很强大，这会拓宽你做网站的道路。
如果你实在有需求，可以联系我付费实现。
