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understrap/woocommerce/single-product/product-thumbnails.php

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<?php
/**
* Single Product Thumbnails
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*
* This template can be overridden by copying it to yourtheme/woocommerce/single-product/product-thumbnails.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/
* @author WooThemes
* @package WooCommerce/Templates
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* @version 3.1.0
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
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global $post, $product;
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$attachment_ids = $product->get_gallery_image_ids();
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if ( $attachment_ids && has_post_thumbnail() ) {
foreach ( $attachment_ids as $attachment_id ) {
$full_size_image = wp_get_attachment_image_src( $attachment_id, 'full' );
$thumbnail = wp_get_attachment_image_src( $attachment_id, 'shop_thumbnail' );
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$attributes = array(
'title' => get_post_field( 'post_title', $attachment_id ),
'data-caption' => get_post_field( 'post_excerpt', $attachment_id ),
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'data-src' => $full_size_image[0],
'data-large_image' => $full_size_image[0],
'data-large_image_width' => $full_size_image[1],
'data-large_image_height' => $full_size_image[2],
);
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$html = '<div data-thumb="' . esc_url( $thumbnail[0] ) . '" class="woocommerce-product-gallery__image"><a href="' . esc_url( $full_size_image[0] ) . '">';
$html .= wp_get_attachment_image( $attachment_id, 'shop_single', false, $attributes );
$html .= '</a></div>';
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echo apply_filters( 'woocommerce_single_product_image_thumbnail_html', $html, $attachment_id );
}
}