下面的代码来自Yoast的Wordpress SEO插件。我正在尝试将页码添加到分页帖子的元描述中（以避免谷歌出现重复问题）。

function metadesc( $echo = true ) {
        if ( get_query_var(\'paged\') && get_query_var(\'paged\') > 1 )
            return;

        global $post, $wp_query, $page;
        $options = get_wpseo_options();

        $metadesc = \'\';
        if (is_singular()) { 
            $metadesc = wpseo_get_value(\'metadesc\');
            if ($metadesc == \'\' || !$metadesc) {
                if ( isset($options[\'metadesc-\'.$post->post_type]) && $options[\'metadesc-\'.$post->post_type] != \'\' )
                    $metadesc = wpseo_replace_vars($options[\'metadesc-\'.$post->post_type], (array) $post );
            }
        } 

        $metadesc = apply_filters( \'wpseo_metadesc\', trim( $metadesc ) );

        if ( $echo ) {
            if ( !empty( $metadesc ) )
                echo \'<meta name="description" content="\'.esc_attr( strip_tags( stripslashes( $metadesc ) ) ).\'\'.Page .\'\'.$page.\'"/>\'."\\n";
            else if ( current_user_can(\'manage_options\') && is_singular() )
                echo \'<!-- \'.__( \'Admin only notice: this page doesn\\\'t show a meta description because it doesn\\\'t have one, either write it for this page specifically or go into the SEO -> Titles menu and set up a template.\', \'wordpress-seo\' ).\' -->\'."\\n";          
        } else {
            return $metadesc;
        }

    }

我添加了$page作为全局变量，可以输出页码，如下所示：

<meta name="description" content="Wordpress SeoPage3"/>

我希望输出在第0页（即第一页）上省略页码，然后添加空格和分隔符（管道或破折号），使其显示

<meta name="description" content="Wordpress Seo Page | 3"/>

谢谢。。

<?php # -*- coding: utf-8 -*-
/**
 * Plugin Name: T5 Add page number to title
 * Description: Adds <code> | Page $number</code> to the page title.
 * License:     MIT
 * License URI: http://www.opensource.org/licenses/mit-license.php
 */

if ( ! function_exists( \'t5_add_page_number\' ) )
{
    function t5_add_page_number( $s )
    {
        global $page;
        $paged = get_query_var( \'paged\' ) ? get_query_var( \'paged\' ) : 1;
        ! empty ( $page ) && 1 < $page && $paged = $page;

        $paged > 1 && $s .= \' | \' . sprintf( __( \'Page: %s\' ), $paged );

        return $s;
    }

    add_filter( \'wp_title\', \'t5_add_page_number\', 100, 1 );
    add_filter( \'wpseo_metadesc\', \'t5_add_page_number\', 100, 1 );
}