我有一些帖子不止一个类别。在post循环中，我根据用户选择的类别获取帖子。如果用户选择了两个类别，其中一篇文章被分配给这两个类别，则循环将复制该文章。我试着用array_unique() 但不起作用。

这是我的代码：

  <?php
    global $current_user;
        get_currentuserinfo();



     //$current_user->user_categories;

     $ucategory = maybe_unserialize($current_user->user_categories);

     foreach ($ucategory as $category) {



    $query = new WP_Query( array( \'post_type\' => array( \'service\'),
                                   \'category__in\' => array($category)));





    $i=0;
    while ( $query->have_posts() ) : $query->the_post();

     if ($i%3==0) echo \'



        \';

          echo \'

                <div class="col-md-4 ">

                    <div class="col-md-12 service-cell">            
                <a href="\'; the_permalink(); echo \'">\';
          echo the_post_thumbnail(\'thumbnail\', array(\'class\' => \'app-icon\'));      
          echo \'<h2 class="center">\'; the_title(); echo \'</h2></a>\';

                foreach((get_the_category()) as $childcat) {
                if (cat_is_ancestor_of(3, $childcat)) {
                echo \'<h3 class="sub">\';
                echo $childcat->cat_name . \'</h3>\';
                }}     


                echo \'<p>\';
                echo excerpt(25);
                echo \'<p><a href="\'; the_permalink(); echo \'">\'; echo \'Wijzig uw gegevens</a>
                  <a class="pull-right"><span class="label label-default"><span class="glyphicon glyphicon-ok"></span></span></a></p>\';
                echo \'</p>\';


          echo \'\';

              echo \'</div></div>\';


        if ($i%3==2) echo \'\'; 
        $i++;
    endwhile;

    }
?>