Рандомный пост из категории.

<?php
    $catID = 5;
	$customPostQuery = new WP_query();
	$customPosts = $customPostQuery->query("cat=$catID");
	 if ($customPosts) : while ($customPosts = $customPostQuery->have_posts()) : $customPosts = $customPostQuery->the_post(); ?>
<?php
 $wordings[] = $post->ID;
 ?>
<?php endwhile; endif; 
 
 if(isset($wordings)&&$wordings) {
   $c = count($wordings)-1;
   $r = $wordings[rand(0, $c)];
 
 
		$pq = new WP_Query();
		$pq->query("p=$r");
 
		 if($pq)
		 { 
		     $pq->have_posts();
		     $pq->the_post();
             the_content(); 
			 edit_post_link('Edit Block', '<p class="editBoxy">', '</p>'); 
		 }
 
 }
 ?>