[WP BR] Remove out of stock product URL and redirect single to home

readme.md

Be aware that it's not recommended to redirect or serve HTTP 404 for out of stock products. Read more in How to Optimize Out of Stock Product Pages.

redirect-out-of-stock.php

<?php
/**
 * adpated from https://stackoverflow.com/questions/42488432/redirect-out-of-stock-product-to-custom-page
 */

add_action('wp', 'wpbr_out_of_stock_redirect');
/**
 * Redirects out of stock product page to the home page
 * @return [type] [description]
 */
function wpbr_out_of_stock_redirect() {
    if (is_product()) {
        global $post;
        $product = wc_get_product($post->ID);
        if (!$product->is_in_stock()) {
            wp_redirect(home_url());
            exit();
        }
    }
}

remove-out-of-stock-product-url.php

<?php

add_filter( 'woocommerce_loop_product_link', 'wpbr_remove_link', 99, 2 );
add_filter( 'woocommerce_product_add_to_cart_url', 'wpbr_remove_link', 99, 2 );

/**
 * Will remove the product URL in case it is out of stock
 * @param  string $link    the product permalink
 * @param  WC_Product      $product
 * @return string
 */
function wpbr_remove_link($link, $product){

    if(!$product->is_in_stock()) {
        $link = '#';
    }

    return $link;

}