// Urunlerin one cikan fotograflarini gizle ve ikinciyi goster
add_action('woocommerce_init', 'replace_loop_product_thumbnail');
function replace_loop_product_thumbnail()
{    
    remove_action('woocommerce_before_shop_loop_item_title', 'woocommerce_template_loop_product_thumbnail',10);
    function replace_product_thumbnail()
    {
        global $product;
        $attachment_id = $product->get_gallery_attachment_ids()[0];
        echo "<img src='" . wp_get_attachment_url( $attachment_id ) . "'>";
    }
    add_action('woocommerce_before_shop_loop_item_title', 'replace_product_thumbnail', 10);
}
add_filter('woocommerce_single_product_image_thumbnail_html', 'hide_thumbnails_except_featured_image', 99, 2);
function hide_thumbnails_except_featured_image($html, $attachment_id)
{
    global $product;
    $new_html = '';
    $featuted_image_id = $product->get_image_id();
    if ($featuted_image_id != $attachment_id)
    {
        $new_html = $html;
    }
    return $new_html;
}