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File Content: variable.php

<?php
/**
 * Variable product add to cart
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/single-product/add-to-cart/variable.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see https://docs.woocommerce.com/document/template-structure/
 * @package WooCommerce\Templates
 * @version 6.1.0
 */

defined( 'ABSPATH' ) || exit;

global $product;

$attribute_keys  = array_keys( $attributes );
$variations_json = wp_json_encode( $available_variations );
$variations_attr = function_exists( 'wc_esc_json' ) ? wc_esc_json( $variations_json ) : _wp_specialchars( $variations_json, ENT_QUOTES, 'UTF-8', true );

do_action( 'woocommerce_before_add_to_cart_form' ); ?>

<form class="variations_form cart"
          action="<?php echo esc_url( apply_filters( 'woocommerce_add_to_cart_form_action', $product->get_permalink() ) ); ?>"
          method="post" enctype='multipart/form-data' data-product_id="<?php echo absint( $product->get_id() ); ?>"
          data-product_variations="<?php echo $variations_attr; // WPCS: XSS ok. ?>">
		<?php do_action( 'woocommerce_before_variations_form' ); ?>

<?php if ( empty( $available_variations ) && false !== $available_variations ) : ?>
            <p class="stock out-of-stock"><?php echo esc_html( apply_filters( 'woocommerce_out_of_stock_message', __( 'This product is currently out of stock and unavailable.', 'woocommerce' ) ) ); ?></p>
		<?php else : ?>
            <div class="variations wpcvs-attributes wpcvs-attributes-stacked" role="presentation">
				<?php foreach ( $attributes as $attribute_name => $options ) : ?>
                    <div class="wpcvs-attribute">
                        <div class="label wpcvs-attribute-label">
                            <label for="<?php echo esc_attr( sanitize_title( $attribute_name ) ); ?>"><?php echo wc_attribute_label( $attribute_name ); // WPCS: XSS ok. ?></label>
                            <span class="wpcvs-attribute-selected"></span>
                        </div>
                        <div class="value wpcvs-attribute-value">
							<?php
							wc_dropdown_variation_attribute_options(
								[
									'options'   => $options,
									'attribute' => $attribute_name,
									'product'   => $product,
								]
							);
							echo end( $attribute_keys ) === $attribute_name ? wp_kses_post( apply_filters( 'woocommerce_reset_variations_link', '<a class="reset_variations" href="#">' . esc_html__( 'Clear', 'woocommerce' ) . '</a>' ) ) : '';
							?>
                        </div>
                    </div>
				<?php endforeach; ?>
            </div>
			<?php do_action( 'woocommerce_after_variations_table' ); ?>

<div class="single_variation_wrap">
				<?php
				/**
				 * Hook: woocommerce_before_single_variation.
				 */
				do_action( 'woocommerce_before_single_variation' );

/**
				 * Hook: woocommerce_single_variation. Used to output the cart button and placeholder for variation data.
				 *
				 * @since 2.4.0
				 * @hooked woocommerce_single_variation - 10 Empty div for variation data.
				 * @hooked woocommerce_single_variation_add_to_cart_button - 20 Qty and cart button.
				 */
				do_action( 'woocommerce_single_variation' );

/**
				 * Hook: woocommerce_after_single_variation.
				 */
				do_action( 'woocommerce_after_single_variation' );
				?>
            </div>
		<?php endif; ?>

<?php do_action( 'woocommerce_after_variations_form' ); ?>
    </form>

<?php
do_action( 'woocommerce_after_add_to_cart_form' );