WordPress: get posts in specific categories

2 comments

1. Using get_posts with the post__in and cat will likely meet your needs.:

   // Create your query argument array
   $args = array(
           'cat'   => '1,2', // Where 1 and 2 are the category ids of Category A and Category B that you want posts containing either of.
           'post__in' => array (1,2,3,4,5) // Where 1-5 are post ids
       );
   
   // Retrieve posts
   $post_list = get_posts( $args );
   

   $post_list will be an array of posts retrieved based on the query parameters passed to get_posts.

   You can get more info on get_posts here and more info on valid query parameters here.

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2. Use get_posts with the category and include arguments.

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