WordPress: Display only parent category on post loop

2 comments

1. foreach (get_the_category() as $cat) {  
       $parent = get_category($cat->category_parent);
       if (!get_category($cat->category_parent)) {
           // do something with the category, like use it to create a new query_posts or something
       }
   }
   

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2. You can get category and check parent field for each entry like;

   <?php
       $categories = get_the_category();
       if($categories){
           foreach($categories as $category) {
               if ($category->parent < 1) {
                   // Your action here
               }
           }
       }
   ?>
   

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