Display theme banner title based on what the page is

banner_title.php

<?php
// Banner Title
function saasland_banner_title() {
    $opt = get_option('saasland_opt');
    if(is_home()) {
        $blog_title = !empty($opt['blog_title']) ? $opt['blog_title'] : esc_html__('Blog', 'appland');
        echo esc_html($blog_title);
    }
    elseif(is_page() || is_single()) {
        the_title();
    }
    elseif(is_archive()) {
        the_archive_title();
    }
    elseif(is_category()) {
        single_cat_title();
    }
    elseif (class_exists('WooCommerce')) {
        if (is_shop()) {
            echo !empty($opt['shop_title']) ? esc_html($opt['shop_title']) : esc_html__('Shop', 'saasland');
        }
    }
    else {
        the_title();
    }
}

function saasland_banner_subtitle() {
    if(is_home()) {
        $blog_subtitle = !empty($opt['blog_subtitle']) ? $opt['blog_subtitle'] : get_bloginfo('description');
        echo esc_html($blog_subtitle);
    }
    elseif(is_page() || is_single()) {
        echo nl2br(get_the_excerpt());
    }
    elseif (class_exists('WooCommerce')) {
        if (is_shop()) {
            echo !empty($opt['shop_subtitle']) ? esc_html($opt['shop_subtitle']) : '';
        }
    }
}