我创建了Woocmerce小部件，它将按产品类别创建循环。产品循环结果应与woocommerce默认内容产品相同。php文件。循环（属性、链接等）中的一切都很好，除了css class. 我不知道我到底把事情搞砸了，but i guess the main problem is within $defaults variable or in woocommerce_loop_add_to_cart_args filter. 请有人帮帮我。

这是我的密码-

function widget($args, $instance) {
    $title = apply_filters( \'widget_title\', $instance[\'title\'] );

    echo $args[\'before_widget\'];
    if ( !empty( $title )) {
        echo $args[\'before_title\'] . $title . $args[\'after_title\'];
    }
    $defaults = array(
        \'cat\' => \'\',
        \'posts\' => \'-1\',
        \'orderby\' => \'name\',
        \'order\' => \'ASC\',
        \'thumbs\' => \'\',
        \'hidden_p\' => \'\',
        \'oos_p\' => \'\',
    );
    if (empty($instance[\'posts\'])) {
        $instance[\'posts\'] = $defaults[\'posts\'];
    }

    if (empty($instance[\'orderby\'])) {
        $instance[\'orderby\'] = $defaults[\'orderby\'];
    }

    if (empty($instance[\'order\'])) {
        $instance[\'order\'] = $defaults[\'order\'];
    }

    ?>

    <ul class="products productsbycat_list productsbycat_<?php echo $instance[\'cat\']; ?> column-4">
        <?php
        $arggs = array(
            \'post_type\' => \'product\',
            \'posts_per_page\' => $instance[\'posts\'],
            \'product_cat\' => $instance[\'cat\'],
            \'orderby\' => $instance[\'orderby\'],
            \'order\' => $instance[\'order\'],
        );
        $loop = new WP_Query($arggs);
        $show_hidden = ($instance[\'hidden_p\'] == \'1\') ? true : false;
        $show_oos = ($instance[\'oos_p\'] == \'1\') ? true : false;

        while ($loop->have_posts()):
            $loop->the_post();
            global $product;
            $show_hidden_product = true;
            $show_oos_product = true;

            if ( $show_hidden ) {
                if ( ! $product->is_visible()) {
                    $show_hidden_product = true;
                }
            } else {
                if ( ! $product->is_visible()) {
                    $show_hidden_product = false;
                }
            }

            if ( $show_oos ) {
                if ( ! $product->managing_stock() && ! $product->is_in_stock()) {
                    $show_oos_product = true;
                }
            } else {
                if ( ! $product->managing_stock() && ! $product->is_in_stock()) {
                    $show_oos_product = false;
                }
            }

            $output = \'\';
            if ($show_hidden_product && $show_oos_product) {
                $output .= \'<li class="\' . esc_attr( implode( \' \', wc_get_product_class( \'\', $product ) ) ) . \'"><div class="global_product_wrapper">\';

                $output .= \'<a href="\'.get_permalink($loop->post->ID).\'" class="woocommerce-LoopProduct-link woocommerce-loop-product__link" title="\'.esc_attr($loop->post->post_title ? $loop->post->post_title : $loop->post->ID).\'">\';



                $image_size = apply_filters( \'single_product_archive_thumbnail_size\', \'woocommerce_thumbnail\' );

                $output .= $product ? $product->get_image( $image_size ) : \'\';
                $output .= \'</a>\';

                $output .= \'<div class="title-and-price">\';

                $output .= \'<a href="\'.get_permalink($loop->post->ID).\'" class="woocommerce-LoopProduct-link woocommerce-loop-product__link" title="\'.esc_attr($loop->post->post_title ? $loop->post->post_title : $loop->post->ID).\'">\';
                $output .= \'<h2 class="\' . esc_attr( apply_filters( \'woocommerce_product_loop_title_classes\', \'woocommerce-loop-product__title\' ) ) . \'">\' . get_the_title() . \'</h2>\'; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
                $output .= \'</a>\';

                if ( $price_html = $product->get_price_html() ) :
                    $output .= \'<span class="price">\' . $price_html . \'</span>\';
                endif;

                $output .= \'</div>\';

                $output .= \'<div class="custom_add_to_cart_wrapper">\';
                        if ( $product ) {
                            $defaults = array(
                                \'quantity\'   => 1,
                                \'class\'      => implode(
                                    \' \',
                                    array_filter(
                                        array(
                                            \'button\',
                                            \'product_type_\' . $product->get_type(),
                                            $product->is_purchasable() && $product->is_in_stock() ? \'add_to_cart_button\' : \'\',
                                            $product->supports( \'ajax_add_to_cart\' ) && $product->is_purchasable() && $product->is_in_stock() ? \'ajax_add_to_cart\' : \'\',
                                        )
                                    )
                                ),
                                \'attributes\' => array(
                                    \'data-product_id\'  => $product->get_id(),
                                    \'data-product_sku\' => $product->get_sku(),
                                    \'aria-label\'       => $product->add_to_cart_description(),
                                    \'rel\'              => \'nofollow\',
                                ),
                            );

                            $args = apply_filters( \'woocommerce_loop_add_to_cart_args\', wp_parse_args( $args, $defaults ), $product );

                            if ( isset( $args[\'attributes\'][\'aria-label\'] ) ) {
                                $args[\'attributes\'][\'aria-label\'] = wp_strip_all_tags( $args[\'attributes\'][\'aria-label\'] );
                            }

                            $output .= apply_filters(
                                \'woocommerce_loop_add_to_cart_link\', // WPCS: XSS ok.
                                sprintf(
                                    \'<a href="%s" data-quantity="%s" class="%s" %s>%s</a>\',
                                    esc_url( $product->add_to_cart_url() ),
                                    esc_attr( isset( $args[\'quantity\'] ) ? $args[\'quantity\'] : 1 ),
                                    esc_attr( isset( $args[\'class\'] ) ? $args[\'class\'] : \'button\' ),
                                    isset( $args[\'attributes\'] ) ? wc_implode_html_attributes( $args[\'attributes\'] ) : \'\',
                                    esc_html( $product->add_to_cart_text() )
                                ),
                                $product,
                                $args
                            );
                        }
                $output .= \'<div>\';

                $output .= \'</div></li>\';
            }
            echo $output;

        endwhile;
        wp_reset_query();
        ?>
    </ul>
<?php

echo $args[\'after_widget\'];
}