<form method="POST">
    <h3>Editing: abstract-wc-widget.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
/**
 * Abstract widget class
 *
 * @class WC_Widget
 * @package  WooCommerce\Abstracts
 */

use Automattic\Jetpack\Constants;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * WC_Widget
 *
 * @package  WooCommerce\Abstracts
 * @version  2.5.0
 * @extends  WP_Widget
 */
abstract class WC_Widget extends WP_Widget {

	/**
	 * CSS class.
	 *
	 * @var string
	 */
	public $widget_cssclass;

	/**
	 * Widget description.
	 *
	 * @var string
	 */
	public $widget_description;

	/**
	 * Widget ID.
	 *
	 * @var string
	 */
	public $widget_id;

	/**
	 * Widget name.
	 *
	 * @var string
	 */
	public $widget_name;

	/**
	 * Settings.
	 *
	 * @var array
	 */
	public $settings;

	/**
	 * Constructor.
	 */
	public function __construct() {
		$widget_ops = array(
			'classname'                   =&gt; $this-&gt;widget_cssclass,
			'description'                 =&gt; $this-&gt;widget_description,
			'customize_selective_refresh' =&gt; true,
			'show_instance_in_rest'       =&gt; true,
		);

		parent::__construct( $this-&gt;widget_id, $this-&gt;widget_name, $widget_ops );

		add_action( 'save_post', array( $this, 'flush_widget_cache' ) );
		add_action( 'deleted_post', array( $this, 'flush_widget_cache' ) );
		add_action( 'switch_theme', array( $this, 'flush_widget_cache' ) );
	}

	/**
	 * Get cached widget.
	 *
	 * @param  array $args Arguments.
	 * @return bool true if the widget is cached otherwise false
	 */
	public function get_cached_widget( $args ) {
		// Don't get cache if widget_id doesn't exists.
		if ( empty( $args['widget_id'] ) ) {
			return false;
		}

		$cache = wp_cache_get( $this-&gt;get_widget_id_for_cache( $this-&gt;widget_id ), 'widget' );

		if ( ! is_array( $cache ) ) {
			$cache = array();
		}

		if ( isset( $cache[ $this-&gt;get_widget_id_for_cache( $args['widget_id'] ) ] ) ) {
			echo $cache[ $this-&gt;get_widget_id_for_cache( $args['widget_id'] ) ]; // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped
			return true;
		}

		return false;
	}

	/**
	 * Cache the widget.
	 *
	 * @param  array  $args Arguments.
	 * @param  string $content Content.
	 * @return string the content that was cached
	 */
	public function cache_widget( $args, $content ) {
		// Don't set any cache if widget_id doesn't exist.
		if ( empty( $args['widget_id'] ) ) {
			return $content;
		}

		$cache = wp_cache_get( $this-&gt;get_widget_id_for_cache( $this-&gt;widget_id ), 'widget' );

		if ( ! is_array( $cache ) ) {
			$cache = array();
		}

		$cache[ $this-&gt;get_widget_id_for_cache( $args['widget_id'] ) ] = $content;

		wp_cache_set( $this-&gt;get_widget_id_for_cache( $this-&gt;widget_id ), $cache, 'widget' );

		return $content;
	}

	/**
	 * Flush the cache.
	 */
	public function flush_widget_cache() {
		foreach ( array( 'https', 'http' ) as $scheme ) {
			wp_cache_delete( $this-&gt;get_widget_id_for_cache( $this-&gt;widget_id, $scheme ), 'widget' );
		}
	}

	/**
	 * Get this widgets title.
	 *
	 * @param array $instance Array of instance options.
	 * @return string
	 */
	protected function get_instance_title( $instance ) {
		if ( isset( $instance['title'] ) ) {
			return $instance['title'];
		}

		if ( isset( $this-&gt;settings, $this-&gt;settings['title'], $this-&gt;settings['title']['std'] ) ) {
			return $this-&gt;settings['title']['std'];
		}

		return '';
	}

	/**
	 * Output the html at the start of a widget.
	 *
	 * @param array $args Arguments.
	 * @param array $instance Instance.
	 */
	public function widget_start( $args, $instance ) {
		echo $args['before_widget']; // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped

		$title = apply_filters( 'widget_title', $this-&gt;get_instance_title( $instance ), $instance, $this-&gt;id_base );

		if ( $title ) {
			echo $args['before_title'] . $title . $args['after_title']; // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped
		}
	}

	/**
	 * Output the html at the end of a widget.
	 *
	 * @param  array $args Arguments.
	 */
	public function widget_end( $args ) {
		echo $args['after_widget']; // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped
	}

	/**
	 * Updates a particular instance of a widget.
	 *
	 * @see    WP_Widget-&gt;update
	 * @param  array $new_instance New instance.
	 * @param  array $old_instance Old instance.
	 * @return array
	 */
	public function update( $new_instance, $old_instance ) {

		$instance = $old_instance;

		if ( empty( $this-&gt;settings ) ) {
			return $instance;
		}

		// Loop settings and get values to save.
		foreach ( $this-&gt;settings as $key =&gt; $setting ) {
			if ( ! isset( $setting['type'] ) ) {
				continue;
			}

			// Format the value based on settings type.
			switch ( $setting['type'] ) {
				case 'number':
					$instance[ $key ] = absint( $new_instance[ $key ] );

					if ( isset( $setting['min'] ) &amp;&amp; '' !== $setting['min'] ) {
						$instance[ $key ] = max( $instance[ $key ], $setting['min'] );
					}

					if ( isset( $setting['max'] ) &amp;&amp; '' !== $setting['max'] ) {
						$instance[ $key ] = min( $instance[ $key ], $setting['max'] );
					}
					break;
				case 'textarea':
					$instance[ $key ] = wp_kses( trim( wp_unslash( $new_instance[ $key ] ) ), wp_kses_allowed_html( 'post' ) );
					break;
				case 'checkbox':
					$instance[ $key ] = empty( $new_instance[ $key ] ) ? 0 : 1;
					break;
				default:
					$instance[ $key ] = isset( $new_instance[ $key ] ) ? sanitize_text_field( $new_instance[ $key ] ) : $setting['std'];
					break;
			}

			/**
			 * Sanitize the value of a setting.
			 */
			$instance[ $key ] = apply_filters( 'woocommerce_widget_settings_sanitize_option', $instance[ $key ], $new_instance, $key, $setting );
		}

		$this-&gt;flush_widget_cache();

		return $instance;
	}

	/**
	 * Outputs the settings update form.
	 *
	 * @see   WP_Widget-&gt;form
	 *
	 * @param array $instance Instance.
	 */
	public function form( $instance ) {

		if ( empty( $this-&gt;settings ) ) {
			return;
		}

		foreach ( $this-&gt;settings as $key =&gt; $setting ) {

			$class = isset( $setting['class'] ) ? $setting['class'] : '';
			$value = isset( $instance[ $key ] ) ? $instance[ $key ] : $setting['std'];

			switch ( $setting['type'] ) {

				case 'text':
					?&gt;
					&lt;p&gt;
						&lt;label for=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot;&gt;&lt;?php echo wp_kses_post( $setting['label'] ); ?&gt;&lt;/label&gt;&lt;?php // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped ?&gt;
						&lt;input class=&quot;widefat &lt;?php echo esc_attr( $class ); ?&gt;&quot; id=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot; name=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_name( $key ) ); ?&gt;&quot; type=&quot;text&quot; value=&quot;&lt;?php echo esc_attr( $value ); ?&gt;&quot; /&gt;
					&lt;/p&gt;
					&lt;?php
					break;

				case 'number':
					?&gt;
					&lt;p&gt;
						&lt;label for=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot;&gt;&lt;?php echo $setting['label']; /* phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped */ ?&gt;&lt;/label&gt;
						&lt;input class=&quot;widefat &lt;?php echo esc_attr( $class ); ?&gt;&quot; id=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot; name=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_name( $key ) ); ?&gt;&quot; type=&quot;number&quot; step=&quot;&lt;?php echo esc_attr( $setting['step'] ); ?&gt;&quot; min=&quot;&lt;?php echo esc_attr( $setting['min'] ); ?&gt;&quot; max=&quot;&lt;?php echo esc_attr( $setting['max'] ); ?&gt;&quot; value=&quot;&lt;?php echo esc_attr( $value ); ?&gt;&quot; /&gt;
					&lt;/p&gt;
					&lt;?php
					break;

				case 'select':
					?&gt;
					&lt;p&gt;
						&lt;label for=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot;&gt;&lt;?php echo $setting['label']; /* phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped */ ?&gt;&lt;/label&gt;
						&lt;select class=&quot;widefat &lt;?php echo esc_attr( $class ); ?&gt;&quot; id=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot; name=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_name( $key ) ); ?&gt;&quot;&gt;
							&lt;?php foreach ( $setting['options'] as $option_key =&gt; $option_value ) : ?&gt;
								&lt;option value=&quot;&lt;?php echo esc_attr( $option_key ); ?&gt;&quot; &lt;?php selected( $option_key, $value ); ?&gt;&gt;&lt;?php echo esc_html( $option_value ); ?&gt;&lt;/option&gt;
							&lt;?php endforeach; ?&gt;
						&lt;/select&gt;
					&lt;/p&gt;
					&lt;?php
					break;

				case 'textarea':
					?&gt;
					&lt;p&gt;
						&lt;label for=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot;&gt;&lt;?php echo $setting['label']; /* phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped */ ?&gt;&lt;/label&gt;
						&lt;textarea class=&quot;widefat &lt;?php echo esc_attr( $class ); ?&gt;&quot; id=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot; name=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_name( $key ) ); ?&gt;&quot; cols=&quot;20&quot; rows=&quot;3&quot;&gt;&lt;?php echo esc_textarea( $value ); ?&gt;&lt;/textarea&gt;
						&lt;?php if ( isset( $setting['desc'] ) ) : ?&gt;
							&lt;small&gt;&lt;?php echo esc_html( $setting['desc'] ); ?&gt;&lt;/small&gt;
						&lt;?php endif; ?&gt;
					&lt;/p&gt;
					&lt;?php
					break;

				case 'checkbox':
					?&gt;
					&lt;p&gt;
						&lt;input class=&quot;checkbox &lt;?php echo esc_attr( $class ); ?&gt;&quot; id=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot; name=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_name( $key ) ); ?&gt;&quot; type=&quot;checkbox&quot; value=&quot;1&quot; &lt;?php checked( $value, 1 ); ?&gt; /&gt;
						&lt;label for=&quot;&lt;?php echo esc_attr( $this-&gt;get_field_id( $key ) ); ?&gt;&quot;&gt;&lt;?php echo $setting['label']; /* phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped */ ?&gt;&lt;/label&gt;
					&lt;/p&gt;
					&lt;?php
					break;

				// Default: run an action.
				default:
					do_action( 'woocommerce_widget_field_' . $setting['type'], $key, $value, $setting, $instance );
					break;
			}
		}
	}

	/**
	 * Get current page URL with various filtering props supported by WC.
	 *
	 * @return string
	 * @since  3.3.0
	 */
	protected function get_current_page_url() {
		if ( Constants::is_defined( 'SHOP_IS_ON_FRONT' ) ) {
			$link = home_url();
		} elseif ( is_shop() ) {
			$link = get_permalink( wc_get_page_id( 'shop' ) );
		} elseif ( is_product_category() ) {
			$link = get_term_link( get_query_var( 'product_cat' ), 'product_cat' );
		} elseif ( is_product_tag() ) {
			$link = get_term_link( get_query_var( 'product_tag' ), 'product_tag' );
		} else {
			$queried_object = get_queried_object();
			$link           = get_term_link( $queried_object-&gt;slug, $queried_object-&gt;taxonomy );
		}

		// Min/Max.
		if ( isset( $_GET['min_price'] ) ) {
			$link = add_query_arg( 'min_price', wc_clean( wp_unslash( $_GET['min_price'] ) ), $link );
		}

		if ( isset( $_GET['max_price'] ) ) {
			$link = add_query_arg( 'max_price', wc_clean( wp_unslash( $_GET['max_price'] ) ), $link );
		}

		// Order by.
		if ( isset( $_GET['orderby'] ) ) {
			$link = add_query_arg( 'orderby', wc_clean( wp_unslash( $_GET['orderby'] ) ), $link );
		}

		/**
		 * Search Arg.
		 * To support quote characters, first they are decoded from &amp;quot; entities, then URL encoded.
		 */
		if ( get_search_query() ) {
			$link = add_query_arg( 's', rawurlencode( htmlspecialchars_decode( get_search_query() ) ), $link );
		}

		// Post Type Arg.
		if ( isset( $_GET['post_type'] ) ) {
			$link = add_query_arg( 'post_type', wc_clean( wp_unslash( $_GET['post_type'] ) ), $link );

			// Prevent post type and page id when pretty permalinks are disabled.
			if ( is_shop() ) {
				$link = remove_query_arg( 'page_id', $link );
			}
		}

		// Min Rating Arg.
		if ( isset( $_GET['rating_filter'] ) ) {
			$link = add_query_arg( 'rating_filter', wc_clean( wp_unslash( $_GET['rating_filter'] ) ), $link );
		}

		// All current filters.
		if ( $_chosen_attributes = WC_Query::get_layered_nav_chosen_attributes() ) { // phpcs:ignore Squiz.PHP.DisallowMultipleAssignments.FoundInControlStructure, WordPress.CodeAnalysis.AssignmentInCondition.Found
			foreach ( $_chosen_attributes as $name =&gt; $data ) {
				$filter_name = wc_attribute_taxonomy_slug( $name );
				if ( ! empty( $data['terms'] ) ) {
					$link = add_query_arg( 'filter_' . $filter_name, implode( ',', $data['terms'] ), $link );
				}
				if ( 'or' === $data['query_type'] ) {
					$link = add_query_arg( 'query_type_' . $filter_name, 'or', $link );
				}
			}
		}

		return apply_filters( 'woocommerce_widget_get_current_page_url', $link, $this );
	}

	/**
	 * Get widget id plus scheme/protocol to prevent serving mixed content from (persistently) cached widgets.
	 *
	 * @since  3.4.0
	 * @param  string $widget_id Id of the cached widget.
	 * @param  string $scheme    Scheme for the widget id.
	 * @return string            Widget id including scheme/protocol.
	 */
	protected function get_widget_id_for_cache( $widget_id, $scheme = '' ) {
		if ( $scheme ) {
			$widget_id_for_cache = $widget_id . '-' . $scheme;
		} else {
			$widget_id_for_cache = $widget_id . '-' . ( is_ssl() ? 'https' : 'http' );
		}

		return apply_filters( 'woocommerce_cached_widget_id', $widget_id_for_cache );
	}
}
</textarea><br>
    <input type="submit" value="Save">
</form>