这个paginate_links() 功能，位于wp-includes/general-template.php, 不允许HTML的某些部分（例如page-numbers 类）进行定制。

由于类的生成方式，简单的字符串替换将不起作用，这在paginate_links():

    $page_links[] = \'<a class="prev page-numbers" href="\' . esc_url( apply_filters( \'paginate_links\', $link ) ) . \'">\' . $args[\'prev_text\'] . \'</a>\';
endif;
for ( $n = 1; $n <= $total; $n++ ) :
    if ( $n == $current ) :
        $page_links[] = "<span class=\'page-numbers current\'>" . $args[\'before_page_number\'] . number_format_i18n( $n ) . $args[\'after_page_number\'] . "</span>";

这是您的custom_pagination() 函数，它使用DOMXpath查找具有page-numbers 类，然后执行字符串替换以将类更改为page-link. 为了更好地与引导程序兼容current 类也替换为active. 最后class="mynewclass" 已添加到<li> 其中包含当前项。

function wpse247219_custom_pagination() {
    global $wp_query;
    $big = 999999999; // need an unlikely integer
    $pages = paginate_links( array(
        \'base\' => str_replace( $big, \'%#%\', esc_url( get_pagenum_link( $big ) ) ),
        \'format\' => \'?paged=%#%\',
        \'current\' => max( 1, get_query_var(\'paged\') ),
        \'total\' => $wp_query->max_num_pages,
        \'prev_next\' => false,
        \'type\'  => \'array\',
        \'prev_next\'   => true,
        \'prev_text\'    => __( \'«\', \'text-domain\' ),
        \'next_text\'    => __( \'»\', \'text-domain\'),
    ) );
    $output = \'\';

    if ( is_array( $pages ) ) {
        $paged = ( get_query_var(\'paged\') == 0 ) ? 1 : get_query_var( \'paged\' );

        $output .=  \'<ul class="pagination">\';
        foreach ( $pages as $page ) {
            $output .= "<li>$page</li>";
        }
        $output .= \'</ul>\';

        // Create an instance of DOMDocument 
        $dom = new \\DOMDocument();

        // Populate $dom with $output, making sure to handle UTF-8, otherwise
        // problems will occur with UTF-8 characters.
        $dom->loadHTML( mb_convert_encoding( $output, \'HTML-ENTITIES\', \'UTF-8\' ) );

        // Create an instance of DOMXpath and all elements with the class \'page-numbers\' 
        $xpath = new \\DOMXpath( $dom );

        // http://stackoverflow.com/a/26126336/3059883
        $page_numbers = $xpath->query( "//*[contains(concat(\' \', normalize-space(@class), \' \'), \' page-numbers \')]" );

        // Iterate over the $page_numbers node...
        foreach ( $page_numbers as $page_numbers_item ) {

            // Add class="mynewclass" to the <li> when its child contains the current item.
            $page_numbers_item_classes = explode( \' \', $page_numbers_item->attributes->item(0)->value );
            if ( in_array( \'current\', $page_numbers_item_classes ) ) {          
                $list_item_attr_class = $dom->createAttribute( \'class\' );
                $list_item_attr_class->value = \'mynewclass\';
                $page_numbers_item->parentNode->appendChild( $list_item_attr_class );
            }

            // Replace the class \'current\' with \'active\'
            $page_numbers_item->attributes->item(0)->value = str_replace( 
                            \'current\',
                            \'active\',
                            $page_numbers_item->attributes->item(0)->value );

            // Replace the class \'page-numbers\' with \'page-link\'
            $page_numbers_item->attributes->item(0)->value = str_replace( 
                            \'page-numbers\',
                            \'page-link\',
                            $page_numbers_item->attributes->item(0)->value );
        }

        // Save the updated HTML and output it.
        $output = $dom->saveHTML();
    }

    return $output;
}

Usage:

echo wpse247219_custom_pagination();

Generated HTML:

<ul class="pagination">
    <li class="mynewclass"><span class="page-link active">1</span></li>
    <li><a class="page-link" href="http://localhost/page/2/">2</a></li>
    <li><a class="page-link" href="http://localhost/page/3/">3</a></li>
    <li><span class="page-link dots">…</span></li>
    <li><a class="page-link" href="http://localhost/page/5/">5</a></li>
    <li><a class="next page-link" href="http://localhost/page/2/">»</a></li>
</ul>