<form method="POST">
    <h3>Editing: CartItemSchema.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
namespace Automattic\WooCommerce\StoreApi\Schemas\V1;

use Automattic\WooCommerce\StoreApi\Utilities\ProductItemTrait;
use Automattic\WooCommerce\StoreApi\Utilities\QuantityLimits;

/**
 * CartItemSchema class.
 */
class CartItemSchema extends ItemSchema {
	use ProductItemTrait;

	/**
	 * The schema item name.
	 *
	 * @var string
	 */
	protected $title = 'cart_item';

	/**
	 * The schema item identifier.
	 *
	 * @var string
	 */
	const IDENTIFIER = 'cart-item';

	/**
	 * Convert a WooCommerce cart item to an object suitable for the response.
	 *
	 * @param array $cart_item Cart item array.
	 * @return array
	 */
	public function get_item_response( $cart_item ) {
		$product = $cart_item['data'];

		/**
		 * Filter the product permalink.
		 *
		 * This is a hook taken from the legacy cart/mini-cart templates that allows the permalink to be changed for a
		 * product. This is specific to the cart endpoint.
		 *
		 * @since 9.9.0
		 *
		 * @param string $product_permalink Product permalink.
		 * @param array  $cart_item         Cart item array.
		 * @param string $cart_item_key     Cart item key.
		 */
		$product_permalink = apply_filters( 'woocommerce_cart_item_permalink', $product-&gt;get_permalink(), $cart_item, $cart_item['key'] );

		return [
			'key'                  =&gt; $cart_item['key'],
			'id'                   =&gt; $product-&gt;get_id(),
			'type'                 =&gt; $product-&gt;get_type(),
			'quantity'             =&gt; wc_stock_amount( $cart_item['quantity'] ),
			'quantity_limits'      =&gt; (object) ( new QuantityLimits() )-&gt;get_cart_item_quantity_limits( $cart_item ),
			'name'                 =&gt; $this-&gt;prepare_html_response( $product-&gt;get_title() ),
			'short_description'    =&gt; $this-&gt;prepare_html_response( wc_format_content( wp_kses_post( $product-&gt;get_short_description() ) ) ),
			'description'          =&gt; $this-&gt;prepare_html_response( wc_format_content( wp_kses_post( $product-&gt;get_description() ) ) ),
			'sku'                  =&gt; $this-&gt;prepare_html_response( $product-&gt;get_sku() ),
			'low_stock_remaining'  =&gt; $this-&gt;get_low_stock_remaining( $product ),
			'backorders_allowed'   =&gt; (bool) $product-&gt;backorders_allowed(),
			'show_backorder_badge' =&gt; (bool) $product-&gt;backorders_require_notification() &amp;&amp; $product-&gt;is_on_backorder( $cart_item['quantity'] ),
			'sold_individually'    =&gt; $product-&gt;is_sold_individually(),
			'permalink'            =&gt; $product_permalink,
			'images'               =&gt; $this-&gt;get_images( $product ),
			'variation'            =&gt; $this-&gt;format_variation_data( $cart_item['variation'], $product ),
			'item_data'            =&gt; $this-&gt;get_item_data( $cart_item ),
			'prices'               =&gt; (object) $this-&gt;prepare_product_price_response( $product, get_option( 'woocommerce_tax_display_cart' ) ),
			'totals'               =&gt; (object) $this-&gt;prepare_currency_response(
				[
					'line_subtotal'     =&gt; $this-&gt;prepare_money_response( $cart_item['line_subtotal'], wc_get_price_decimals() ),
					'line_subtotal_tax' =&gt; $this-&gt;prepare_money_response( $cart_item['line_subtotal_tax'], wc_get_price_decimals() ),
					'line_total'        =&gt; $this-&gt;prepare_money_response( $cart_item['line_total'], wc_get_price_decimals() ),
					'line_total_tax'    =&gt; $this-&gt;prepare_money_response( $cart_item['line_tax'], wc_get_price_decimals() ),
				]
			),
			'catalog_visibility'   =&gt; $product-&gt;get_catalog_visibility(),
			self::EXTENDING_KEY    =&gt; $this-&gt;get_extended_data( self::IDENTIFIER, $cart_item ),
		];
	}

	/**
	 * Format cart item data removing any HTML tag.
	 *
	 * @param array $cart_item Cart item array.
	 * @return array
	 */
	protected function get_item_data( $cart_item ) {
		/**
		 * Filters cart item data.
		 *
		 * Filters the variation option name for custom option slugs.
		 *
		 * @since 4.3.0
		 *
		 * @internal Matches filter name in WooCommerce core.
		 *
		 * @param array $item_data Cart item data. Empty by default.
		 * @param array $cart_item Cart item array.
		 * @return array
		 */
		$item_data       = apply_filters( 'woocommerce_get_item_data', array(), $cart_item );
		$clean_item_data = [];
		foreach ( $item_data as $data ) {
			// We will check each piece of data in the item data element to ensure it is scalar. Extensions could add arrays
			// to this, which would cause a fatal in wp_strip_all_tags. If it is not scalar, we will return an empty array,
			// which will be filtered out in get_item_data (after this function has run).
			foreach ( $data as $data_value ) {
				if ( ! is_scalar( $data_value ) ) {
					continue 2;
				}
			}
			$clean_item_data[] = $this-&gt;format_item_data_element( $data );
		}
		return $clean_item_data;
	}

	/**
	 * Remove HTML tags from cart item data and set the `hidden` property to `__experimental_woocommerce_blocks_hidden`.
	 *
	 * @param array $item_data_element Individual element of a cart item data.
	 * @return array
	 */
	protected function format_item_data_element( $item_data_element ) {
		if ( array_key_exists( '__experimental_woocommerce_blocks_hidden', $item_data_element ) ) {
			$item_data_element['hidden'] = $item_data_element['__experimental_woocommerce_blocks_hidden'];
		}
		return array_map( 'wp_strip_all_tags', $item_data_element );
	}
}
</textarea><br>
    <input type="submit" value="Save">
</form>