我正在尝试向services 自定义帖子类型。但是，当我将此函数应用于post类过滤器时，它将此函数应用于所有post类型。我的目标是改变布局services 使用CSS类归档页面。

问题是if ( is_singular(\'services\') ) 部分或与global $wp_query; 可能会查询每个帖子？任何解决方案都将不胜感激。

完整代码：

add_filter( \'post_class\', \'woo_custom_add_post_classes\', 10);

function woo_custom_add_post_classes ( $classes ) {
    if ( is_singular(\'services\') ) { return $classes; }


    global $wp_query; 

    // Get the number of the current post in the loop.
    $current_count = $wp_query->current_post + 1;

    // Work out whether this post is the last in a row.

    $iflast = \'last\';

    if ($current_count % 3 == 0 ) { $iflast = \'last\'; } else { $iflast = \'\';}

    // Add the classes to the array of CSS classes.
    $classes[] = \'service-number-\' . $current_count; // Service number. 
    $classes[] = \'threecol-one\';
    $classes[] = $iflast; // Last in the row or nothing 

    return $classes;

} // End woo_custom_add_post_classes()