補足授業9. 過去記事の一覧表示ページを作ってた話

<?php
/*
Plugin Name: Takeken Shortcodes
*/

add_filter( 'redirect_canonical', function( $redirect_url, $requested_url ) {
    if ( is_page() && ( get_query_var( 'paged' ) > 0 || get_query_var( 'page' ) > 0 ) ) {
        return false;
    }
    return $redirect_url;
}, 10, 2 );

add_shortcode( 'archive_all', function() {
    $paged = max( get_query_var( 'paged' ), get_query_var( 'page' ), 1 );

    $posts = new WP_Query( array(
        'posts_per_page' => 35,
        'post_status'    => 'publish',
        'paged'          => $paged,
    ) );

    $html = '';
    if ( $posts->have_posts() ) {
        $html .= '<ul>';
        while ( $posts->have_posts() ) {
            $posts->the_post();
            $html .= '<li><a href="' . esc_url( get_permalink() ) . '">'
                    . esc_html( get_the_title() ) . '</a></li>';
        }
        $html .= '</ul>';
        wp_reset_postdata();

        $html .= paginate_links( array(
            'base'    => add_query_arg( 'paged', '%#%' ),
            'format'  => '',
            'current' => $paged,
            'total'   => $posts->max_num_pages,
        ) );
    }
    return $html;
} );