如果粘性帖子位于第一页，则会出现问题。

解决方案是减少作为第一页一部分的粘性帖子的粘性帖子数量。

function fix_posts_per_page_with_sticky_posts( $query ) {

    if ( $query->is_main_query() ) {

        // set the number of posts per page
        $posts_per_page = 12;

        // get sticky posts array
        $sticky_posts = get_option( \'sticky_posts\' );

        // get queried post ids array
        $ids = array();
        $args = array(
            \'post_type\' => \'post\',
            \'post_per_page\' => $posts_per_page,
            \'paged\' => 1
        );

        $posts = get_posts( $args );

        foreach ( $posts as $post ) {
            $ids[] = $post->ID;
        }

        // if we have any sticky posts and we are at the first page
        if ( is_array( $sticky_posts ) && ! $query->is_paged() ) {

            // count the number of sticky posts
            $sticky_count = count( $sticky_posts );

            foreach ( $sticky_posts as $sticky_post ) {
                if ( in_array( $sticky_post, $ids ) ) {
                    // decrement sticky posts count if the sticky post in on the page
                    $sticky_count--;
                }
            }

            // and if the number of sticky posts is less than
            // the number we want to set:
            if ( $sticky_count < $posts_per_page ) {
                $query->set( \'posts_per_page\', $posts_per_page - $sticky_count );

            // if the number of sticky posts is greater than or equal
            // the number of pages we want to set:
            } else {
                $query->set( \'posts_per_page\', 1 );
            }

        // fallback in case we have no sticky posts
        // and we are not on the first page
        } else {
            $query->set( \'posts_per_page\', $posts_per_page );
        }
    }
}
add_action( \'pre_get_posts\', \'fix_posts_per_page_with_sticky_posts\'  );

我将上述两个答案整理成一个，这样它就不会加载不必要的WP\\U查询，修复了第一页上的粘性问题，减少了处理信息的时间，代码更简洁、速度更快。

function modify_main_query( $query ) {
   if ( ( $query->is_home() || is_front_page() ) && $query->is_main_query() ) {
         // set the number of posts per page
        $posts_per_page = 12;
        // get sticky posts array
        $sticky_posts = get_option( \'sticky_posts\' );
        // if we have any sticky posts and we are at the first page
        if (is_array($sticky_posts) && !$query->is_paged()) {
            // make a second query to make sure the sticky posts will still work 
            // correctly when on the first page
            // Only reply with the ID\'s as that is all that is needed
            $args = [
                \'post_type\' => \'post\',
                \'post_per_page\' => $posts_per_page,
                \'paged\' => 1,
                \'fields\' => \'ids\'
            ];
            // Array flip to reduce the time taken by 
            // using isset and not in_array
            $posts = array_flip( get_posts( $args ) );

            // count the number of sticky posts
            $sticky_count = count($sticky_posts);

            // loop the posts from the 2nd query to see if the ID\'s of the sticky posts
            // sit inside it.
            foreach ( $sticky_posts as $sticky_post ) {
                if(isset($posts[$sticky_post])){
                    $sticky_count--;
                }
            }
            // and if the number of sticky posts is less than
            // the number we want to set:
            if ($sticky_count < $posts_per_page) {
               $query->set(\'posts_per_page\', $posts_per_page - $sticky_count);
            } else {
                // if the number of sticky posts is greater than or equal
                // the number of pages we want to set:
                $query->set(\'posts_per_page\', 1);
            }
        // fallback in case we have no sticky posts
        // and we are not on the first page
        } else {
            $query->set(\'posts_per_page\', $posts_per_page);
        }
    } 
}

add_action( "pre_get_posts", \'modify_main_query\' );

这里写的答案可以完成任务，但WordPress提供了一种更简单的方法。作为WP_Query 类，WordPress包括current_post 所有物调用时，每次通过循环处理新帖子时，此属性都会增加1$my_query->the_post(). 该属性最初设置为-1。

因此，为了确保始终显示正确数量的帖子，包括粘性帖子，可以这样设置。在下面的示例中，无论有多少粘性帖子，总会显示两篇博客帖子。

<?php
$posts_per_page = 2;
$args           = array(
    \'posts_per_page\' => $posts_per_page,
);

$my_query = new WP_Query( $args );

if ( $my_query->have_posts() ) :

    while ( $my_query->have_posts() && $my_query->current_post + 1 < $posts_per_page ) :

        $my_query->the_post();

        // Run code to output your posts...

    endwhile;

endif;