arrays - Wordpress Query parsing only author ids -

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i need array author ids loop, each 1 once if possible , out of posts in loop. suggestions? regards

following code helpfull you.

if(have_posts()){    $author_arr = array();    while(have_posts()){         the_post();         global $post;         if(!in_array($post->post_author,$author_arr)){            $author_arr[] = $post->post_author;         }     } }

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