カスタム投稿タイプ使用時のパーマリンクをPostnameからPost_Idにする（２）

// functions.php
add_action('init', 'myposttype_rewrite');
function myposttype_rewrite() {
    global $wp_rewrite;
    $queryarg = 'post_type=faqs&p=';
    $wp_rewrite->add_rewrite_tag('%cpt_id%', '([^/]+)', $queryarg);
    $wp_rewrite->add_permastruct('faqs', '/faqs/%cpt_id%.html', false);
}

add_filter('post_type_link', 'myposttype_permalink', 1, 3);
function myposttype_permalink($post_link, $id = 0, $leavename) {
    global $wp_rewrite;
    $post = &get_post($id);
    if ( is_wp_error( $post ) )
        return $post;
    $newlink = $wp_rewrite->get_extra_permastruct('faqs');
    $newlink = str_replace("%cpt_id%", $post->ID, $newlink);
    $newlink = home_url(user_trailingslashit($newlink));
    return $newlink;
}

// functions.php
add_action('init', 'myposttype_rewrite');
function myposttype_rewrite() {
    global $wp_rewrite;

    $queryarg = 'post_type=designs&p=';
    $wp_rewrite->add_rewrite_tag('%designs_id%', '([^/]+)',$queryarg);
    $wp_rewrite->add_permastruct('designs', '/designs/%designs_id%.html', false);

    $queryarg = 'post_type=faqs&p=';
    $wp_rewrite->add_rewrite_tag('%faqs_id%', '([^/]+)',$queryarg);
    $wp_rewrite->add_permastruct('faqs', '/faqs/%faqs_id%.html', false);

    $queryarg = 'post_type=products&p=';
    $wp_rewrite->add_rewrite_tag('%products_id%', '([^/]+)',$queryarg);
    $wp_rewrite->add_permastruct('products', '/products/%products_id%.html', false);
}

add_filter('post_type_link', 'myposttype_permalink', 1, 3);

function myposttype_permalink($post_link, $id = 0, $leavename) {
    global $wp_rewrite;
    $post = &get_post($id);
    if ( is_wp_error( $post ) )
        return $post;
    $newlink = $wp_rewrite->get_extra_permastruct($post->post_type);
    $newlink = str_replace('%'.$post->post_type.'_id%', $post->ID, $newlink);
    $newlink = home_url(user_trailingslashit($newlink));
    return $newlink;
}