woocommerce/includes/admin/meta-boxes/views/html-product-data-inventory.php

<?php
/**
 * Displays the inventory tab in the product data meta box.
 *
 * @package WooCommerce\Admin
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
?>
<div id="inventory_product_data" class="panel woocommerce_options_panel hidden">

	<div class="options_group">
		<?php
		if ( wc_product_sku_enabled() ) {
			woocommerce_wp_text_input(
				array(
					'id'          => '_sku',
					'value'       => $product_object->get_sku( 'edit' ),
					'label'       => '<abbr title="' . esc_attr__( 'Stock Keeping Unit', 'woocommerce' ) . '">' . esc_html__( 'SKU', 'woocommerce' ) . '</abbr>',
					'desc_tip'    => true,
					'description' => __( 'SKU refers to a Stock-keeping unit, a unique identifier for each distinct product and service that can be purchased.', 'woocommerce' ),
				)
			);
		}

		do_action( 'woocommerce_product_options_sku' );

		if ( 'yes' === get_option( 'woocommerce_manage_stock' ) ) {

			woocommerce_wp_checkbox(
				array(
					'id'            => '_manage_stock',
					'value'         => $product_object->get_manage_stock( 'edit' ) ? 'yes' : 'no',
					'wrapper_class' => 'show_if_simple show_if_variable',
					'label'         => __( 'Manage stock?', 'woocommerce' ),
					'description'   => __( 'Enable stock management at product level', 'woocommerce' ),
				)
			);

			do_action( 'woocommerce_product_options_stock' );

			echo '<div class="stock_fields show_if_simple show_if_variable">';

			woocommerce_wp_text_input(
				array(
					'id'                => '_stock',
					'value'             => wc_stock_amount( $product_object->get_stock_quantity( 'edit' ) ),
					'label'             => __( 'Stock quantity', 'woocommerce' ),
					'desc_tip'          => true,
					'description'       => __( 'Stock quantity. If this is a variable product this value will be used to control stock for all variations, unless you define stock at variation level.', 'woocommerce' ),
					'type'              => 'number',
					'custom_attributes' => array(
						'step' => 'any',
					),
					'data_type'         => 'stock',
				)
			);

			echo '<input type="hidden" name="_original_stock" value="' . esc_attr( wc_stock_amount( $product_object->get_stock_quantity( 'edit' ) ) ) . '" />';

			woocommerce_wp_select(
				array(
					'id'          => '_backorders',
					'value'       => $product_object->get_backorders( 'edit' ),
					'label'       => __( 'Allow backorders?', 'woocommerce' ),
					'options'     => wc_get_product_backorder_options(),
					'desc_tip'    => true,
					'description' => __( 'If managing stock, this controls whether or not backorders are allowed. If enabled, stock quantity can go below 0.', 'woocommerce' ),
				)
			);

			woocommerce_wp_text_input(
				array(
					'id'                => '_low_stock_amount',
					'value'             => $product_object->get_low_stock_amount( 'edit' ),
					'placeholder'       => sprintf(
						/* translators: %d: Amount of stock left */
						esc_attr__( 'Store-wide threshold (%d)', 'woocommerce' ),
						esc_attr( get_option( 'woocommerce_notify_low_stock_amount' ) )
					),
					'label'             => __( 'Low stock threshold', 'woocommerce' ),
					'desc_tip'          => true,
					'description'       => __( 'When product stock reaches this amount you will be notified by email. It is possible to define different values for each variation individually. The shop default value can be set in Settings > Products > Inventory.', 'woocommerce' ),
					'type'              => 'number',
					'custom_attributes' => array(
						'step' => 'any',
					),
				)
			);

			do_action( 'woocommerce_product_options_stock_fields' );

			echo '</div>';
		}

		woocommerce_wp_select(
			array(
				'id'            => '_stock_status',
				'value'         => $product_object->get_stock_status( 'edit' ),
				'wrapper_class' => 'stock_status_field hide_if_variable hide_if_external hide_if_grouped',
				'label'         => __( 'Stock status', 'woocommerce' ),
				'options'       => wc_get_product_stock_status_options(),
				'desc_tip'      => true,
				'description'   => __( 'Controls whether or not the product is listed as "in stock" or "out of stock" on the frontend.', 'woocommerce' ),
			)
		);

		do_action( 'woocommerce_product_options_stock_status' );
		?>
	</div>

	<div class="options_group show_if_simple show_if_variable">
		<?php
		woocommerce_wp_checkbox(
			array(
				'id'            => '_sold_individually',
				'value'         => $product_object->get_sold_individually( 'edit' ) ? 'yes' : 'no',
				'wrapper_class' => 'show_if_simple show_if_variable',
				'label'         => __( 'Sold individually', 'woocommerce' ),
				'description'   => __( 'Enable this to only allow one of this item to be bought in a single order', 'woocommerce' ),
			)
		);

		do_action( 'woocommerce_product_options_sold_individually' );
		?>
	</div>

	<?php do_action( 'woocommerce_product_options_inventory_product_data' ); ?>
</div>