您可以使用found_posts filter 更改WordPress报告从查询中查找的帖子数。

add_filter( \'found_posts\', \'wpd_found_posts\', 10, 2 );
function wpd_found_posts( $found_posts, $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        return 25;
    }
}

使用post_limits 挂钩优先级为2。。。

function my_posts_limit( $limit, $query ) {
  return \'LIMIT 0, 25\';
}
add_filter( \'post_limits\', \'my_posts_limit\', 10, 2 );

post_limits

/**
 * Limit the main query search results to 25.
 *
 * We only want to filter the limit on the front end of the site, so we use
 * is_admin() to check that we aren\'t on the admin side.
 *
 * We also only want to filter the main query, so we check that this is it
 * with $query->is_main_query().
 *
 * Finally, we only want to change the limit for searches, so we check that
 * this query is a search with $query->is_search().
 *
 * @see http://codex.wordpress.org/Plugin_API/Filter_Reference/post_limits
 * 
 * @param string $limit The \'LIMIT\' clause for the query.
 * @param object $query The current query object.
 *
 * @return string The filtered LIMIT.
 */
function wpcodex_filter_main_search_post_limits( $limit, $query ) {

    if ( ! is_admin() && $query->is_main_query() && ($query->is_search() || $query->is_home()) ){
        return \'LIMIT 0, 25\';
    }

    return $limit;
}
add_filter( \'post_limits\', \'wpcodex_filter_main_search_post_limits\', 10, 2 );

您可以通过两种方式设置post限制：

1) wp-admin > Settings > Reading

2) By passing the argument query \'numberposts\' => 5

使用\'numberposts\' 参数

$args = array(
\'post_type\' => \'post\',
\'numberposts\' => 25,
\'posts_per_page\' => 5,
\'paged\' => $paged
);

Exemple at the Developer\'s Codex