When the WordPress category page calls a pinned article, if there is no pinned article, it will automatically call a normal article.

I recently discovered that when the WordPress category page calls a pinned article, if there is no pinned article, it will automatically call a normal article. My code for calling the pinned article is as follows:

 $cat,
'post__in' => $sticky_posts,
'posts_per_page' => 2,
);
$query = new WP_Query( $args );
while ( $query->have_posts() ) : $query->the_post();
?>
...

After using the echo method, I found that when there is no sticky article, the post__in condition is automatically ignored, so I came up with a temporary solution, which is to judge that $sticky_posts is empty and add a 0 to the array, so that post__in will Generate a query id in (0), so it cannot be queried.

 if(empty($sticky_posts)){
$sticky_posts = [0];
}
$args = array(
'cat'=> $cat,
'post__in' => $sticky_posts,
'posts_per_page' => 2,
);
$query = new WP_Query( $args );
while ( $query->have_posts() ) : $query->the_post();
?>
...

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