php - Adding a post of certain category every nth post -


i have 2 arrays posts, $portfolio_items , $ad_items. every third post should post $ad_items. posts $ad_items can repeat until posts $portfolio_items have been displayed.

i'm kind of novice when comes php, i'm having hard time wrapping head around problem. pointers , tips appreciated. thanks!

edit: managed solve it, feeling code clumsy , bloated.

<?php     $counter = 1;     $rotation = 3;     $ad_counter = 0;     $ad_id = array();      $query1 = new wp_query(array(         "post_type" => "post",         "post_status" => "publish",         "tax_query" => array(             array(                 "taxonomy" => "category",                 "field" => "slug",                 "terms" => "test",                 "operator" => "not in"             )         )     ));      $query2 = new wp_query(array(         "post_type" => "post",         "post_status" => "publish",         "tax_query" => array(             array(                 "taxonomy" => "category",                 "field" => "slug",                 "terms" => "test"             )         )     ));      if($query2 -> have_posts())     {         while($query2 -> have_posts()) : $query2 -> the_post();             array_push($ad_id, get_the_id());         endwhile;     }      if($query1 -> have_posts())     {         while($query1 -> have_posts())         {             if($counter == $rotation)             {                 if($ad_counter >= count($ad_id))                 {                     $ad_counter = 1;                 }                 else                 {                     $ad_counter++;                 }                 $t = get_post($ad_id[$ad_counter-1]);                 ?>                 <div class="post type-post status-publish format-standard hentry red">                     <h1> <?php echo $t->post_title; ?> </h1>                     <p> <?php $t->post_content; ?> </p>                 </div>                 <?php                 $counter = 0;             }             else             {                 $query1 -> the_post();                 get_template_part("template/testpost");             }             $counter++;         }             wp_reset_postdata();     } ?>

this typical modulo task. here pseudo code:

for ($i=0; $i<20; $i++) {     if (($i % 3) == 0) // sth.     else // sth. else or don't @ }

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