保留以前的GET值，并在提交时添加另一个值

我是个超级新手，所以我会尽力解释。

我有一个博客页面，我想按类别过滤，我希望用户能够点击多个类别，它将过滤以显示这些帖子。

我知道了如何做一个帖子分类，我只是不知道如何保持已经点击的值并添加另一个值。

我现在拥有的

我想我在找什么

http://localhost/blog/?filter=issues&voices

导航

<form action="/blog" method="get">
 <ul class="show">
    <li><button name="filter" type="submit" value="all">All</button></li>
    <li><button name="filter" type="submit" value="issues" class="active">Issues</button></li>
    <li><button name="filter" type="submit" value="members-voice">Member\'s Voice</button></li>
    <li><button name="filter" type="submit" value="politics">Politics</button></li>
    <li><button name="filter" type="submit" value="voices">Voices</button></li>                        
 </ul>                       
</form>

如何查询帖子

<?php $query = "";
      if ($_GET[\'filter\'] == \'all\') {
         $categories = get_categories( $args );
             foreach ($categories as $category) {
               $fliterArray[] = $category->slug;
               $query = implode(",", $fliterArray);
             }
             } else {
               $query = $_GET[\'filter\'];
             }
             ?>
                <ul>
                   <?php $args = array(
                         \'post_type\' => array(\'slideshow_article\',\'interior\'),
                            \'category_name\' => $query, // This needs to be either one Categorie or a few Categorie or All Categorie
                            \'posts_per_page\' => 1000,
                            \'meta_query\' => array(
                                array(
                                    \'key\' => \'hide_feed\', // name of custom field
                                    \'value\' => \'0\',
                                )
                            ),
                        ); ?>

<?php // If there is a value to filter if($_GET[\'filter\']) { // $urlHasFilter = true; // Create an array out of query string of the filters example (issues,voices) $urlFilters = explode(\',\', $_GET[\'filter\']); } else { // $urlHasFilter = false; // if filter has nothing create an empty array $urlFilters = array(); } $isAll = \'\'; // if filter = all add class active to that link if($_GET[\'filter\'] == \'all\') { $isAll = \'active\'; } ?> <ul> <li><a href="?filter=all" class="<?php echo $isAll; ?>">All</a></li> <?php $args = array( \'orderby\' => \'name\', \'parent\' => 0, // \'exclude\' => 3, ); $categories = get_categories($args); // loop through the categorys that are being used. foreach ( $categories as $category ) { $class = ""; $active = false; $urlFiltersMinus = array(); // Loop through the array of query strings foreach($urlFilters as $urlFilter) { // Added class "active" if matches that Category slug if($urlFilter == $category->slug) { $class = "active"; $active = true; } else { $urlFiltersMinus[] = $urlFilter; } } if($active) { $url = implode(\',\', $urlFiltersMinus); } else { $urlFiltersMinus[] = $category->slug; $url = implode(\',\', $urlFiltersMinus); } echo \'<li><a href="?filter=\'.$url.\'"class=\'.$class.\'value="\'.$url.\'">\'.$category->name.\'</a></li>\'; } ?> </ul>

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