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Editing:meta.php

<?php
/**
 * Single Product Meta
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/single-product/meta.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
 * @version 3.0.0
 * @xstore-version 9.4.0
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
global $product;

$settings = array();

$settings['elements'] = array(
	'sku',
	'gtin',
	'categories',
	'tags'
);

$settings['content'] = array();

if ( get_option( 'etheme_single_product_builder', false ) && function_exists( 'etheme_core_hooks' ) ) {
	$settings['elements'] = get_theme_mod( 'product_meta_content', 
		array(
			'sku',
            'gtin',
			'categories',
			'tags',
		)
	);
}

$settings['elements'] = apply_filters( 'product_meta_elements', $settings['elements'] );
$settings['product_type'] = $product->get_type();
$settings['_product_id'] = $product->get_id();
$settings['product_id_origin'] = $settings['_product_id'];
$settings['product_id'] = $settings['_product_id'];
if ( $settings['product_type'] == 'variation' ) {
	$settings['product_id'] = $product->get_parent_id();
}

ob_start();

if ( wc_product_sku_enabled() && ( $product->get_sku() || $settings['product_type'] == 'variable' ) ) : ?>

<?php esc_html_e( 'SKU:', 'xstore' ); ?> <?php echo esc_html( ( $sku = $product->get_sku() ) ? $sku : esc_html__( 'N/A', 'xstore' ) ); ?>

<?php endif;

$settings['content']['sku'] = ob_get_clean();

ob_start();

if ( apply_filters('etheme_product_option_gtin', true) ) {
    $gtin = get_post_meta( $settings['product_id_origin'], '_et_gtin', true );
    $gtin_ghost = false;

if ( !$gtin && $settings['product_type'] == 'variable' ) {
        $children_have_gtin = array_filter( $product->get_children(), function ($localProdId) {
            return !empty(get_post_meta( $localProdId, '_et_gtin', true ));
        } );
        if ( $children_have_gtin )
            $gtin_ghost = true;
    }
    // in case it is product variation gtin field
    if ( !$gtin && $settings['product_id_origin'] != $settings['product_id'] ) {
        $gtin = get_post_meta($settings['product_id'], '_et_gtin', true);
        $gtin_ghost = false;
    }

if ( $gtin || $gtin_ghost ) : ?>
 <?php esc_html_e( 'GTIN:', 'xstore' ); ?> 
 <?php echo esc_html( (!$gtin_ghost) ? $gtin : esc_html__( 'N/A', 'xstore' )); ?>
 
 <?php endif;
}

$settings['content']['gtin'] = ob_get_clean();

ob_start();

etheme_product_cats( true );

$settings['content']['categories'] = ob_get_clean();

ob_start();

echo wc_get_product_tag_list( $settings['product_id'], ', ', '' . _n( 'Tag:', 'Tags:', count( $product->get_tag_ids() ), 'xstore' ) . ' ', '' );

$settings['content']['tags'] = ob_get_clean();

if (in_array('custom', $settings['elements'])){
	ob_start();
	$custom_content = apply_filters('product_meta_custom_content_filter', get_theme_mod( 'product_meta_custom_content', ''));
	echo do_shortcode($custom_content);
	$settings['content']['custom'] = ob_get_clean();
}

if ( count( $settings['elements'] ) < 1 ) {
	return;
}

?>
<div class="product_meta"><?php do_action( 'woocommerce_product_meta_start' );
	foreach ( $settings['elements'] as $key ) {
		echo !empty($settings['content'][ $key ]) ? ' ' . $settings['content'][ $key ] : '';
	}
	do_action( 'woocommerce_product_meta_end' ); ?></div>

<?php unset( $settings ); ?>

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Editing:meta.php