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Edit File: class-wc-product-query.php

<?php
/**
 * Class for parameter-based Product querying
 *
 * Args and usage: https://github.com/woocommerce/woocommerce/wiki/wc_get_products-and-WC_Product_Query
 *
 * @package  WooCommerce\Classes
 * @version  3.2.0
 * @since    3.2.0
 */

use Automattic\WooCommerce\Enums\ProductStatus;

defined( 'ABSPATH' ) || exit;

/**
 * Product query class.
 */
class WC_Product_Query extends WC_Object_Query {

/**
	 * Valid query vars for products.
	 *
	 * @return array
	 */
	protected function get_default_query_vars() {
		return array_merge(
			parent::get_default_query_vars(),
			array(
				'status'            => array( ProductStatus::DRAFT, ProductStatus::PENDING, ProductStatus::PRIVATE, ProductStatus::PUBLISH ),
				'type'              => array_merge( array_keys( wc_get_product_types() ) ),
				'limit'             => get_option( 'posts_per_page' ),
				'include'           => array(),
				'date_created'      => '',
				'date_modified'     => '',
				'featured'          => '',
				'visibility'        => '',
				'sku'               => '',
				'price'             => '',
				'regular_price'     => '',
				'sale_price'        => '',
				'date_on_sale_from' => '',
				'date_on_sale_to'   => '',
				'total_sales'       => '',
				'tax_status'        => '',
				'tax_class'         => '',
				'manage_stock'      => '',
				'stock_quantity'    => '',
				'stock_status'      => '',
				'backorders'        => '',
				'low_stock_amount'  => '',
				'sold_individually' => '',
				'weight'            => '',
				'length'            => '',
				'width'             => '',
				'height'            => '',
				'reviews_allowed'   => '',
				'virtual'           => '',
				'downloadable'      => '',
				'category'          => array(),
				'tag'               => array(),
				'shipping_class'    => array(),
				'download_limit'    => '',
				'download_expiry'   => '',
				'average_rating'    => '',
				'review_count'      => '',
			)
		);
	}

/**
	 * Get products matching the current query vars.
	 *
	 * @return array|object of WC_Product objects
	 */
	public function get_products() {
		$args    = apply_filters( 'woocommerce_product_object_query_args', $this->get_query_vars() );
		$results = WC_Data_Store::load( 'product' )->query( $args );
		return apply_filters( 'woocommerce_product_object_query', $results, $args );
	}
}

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