Get query result before posts are displayed?

Question

If I want to modify the query, I can use pre_get_posts filter. But what if I want to loop through the queried posts before they are ran through the The Loop? Is there a filter/action hook for that? I want to find out if all the queried posts belong to same term and then do something if they are not. Please note that creating a custom Query is not an option.

Answer 1

You can use the the_posts filter to loop through the results before they get returned.

Proof of concept:

function test_the_posts($a) {
  var_dump($a); die;
}
add_action('the_posts','test_the_posts');

I am fairly certain (though I haven't tested it) that you could pretty easily break pagination and probably other things by fiddling with that, so be careful.