这是我用来替代的wp_link_pages(). 它不使用单独的类，而是为当前页面使用另一个元素，因为页面不应该链接到当前URL。

/**
 * Modification of wp_link_pages() with an extra element to highlight the current page.
 *
 * @param  array $args
 * @return void
 */
function t5_numerical_link_pages( $args = array () )
{
    $defaults = array(
        \'before\'      => \'<p>\' . __( \'Pages:\', \'t5_theme\' )
    ,   \'after\'       => \'</p>\'
    ,   \'link_before\' => \'\'
    ,   \'link_after\'  => \'\'
    ,   \'pagelink\'    => \'%\'
    ,   \'echo\'        => 1
    // element for the current page
    ,   \'highlight\'   => \'b\'
    );

    $r = wp_parse_args( $args, $defaults );
    $r = apply_filters( \'wp_link_pages_args\', $r );
    extract( $r, EXTR_SKIP );

    global $page, $numpages, $multipage, $more, $pagenow;

    if ( ! $multipage )
    {
        return;
    }

    $output = $before;

    for ( $i = 1; $i < ( $numpages + 1 ); $i++ )
    {
        $j       = str_replace( \'%\', $i, $pagelink );
        $output .= \' \';

        if ( $i != $page || ( ! $more && 1 == $page ) )
        {
            $output .= _wp_link_page( $i ) . "{$link_before}{$j}{$link_after}</a>";
        }
        else
        {   // highlight the current page
            // not sure if we need $link_before and $link_after
            $output .= "<$highlight>{$link_before}{$j}{$link_after}</$highlight>";
        }
    }

    $echo and print $output . $after;
    return $output . $after;
}