woocommerce_before_widget_product_review_list │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_before_widget_product_review_list', 'wp_kama_woocommerce_before_widget_product_review_list_filter' );

/**
 * Function for `woocommerce_before_widget_product_review_list` filter-hook.
 * 
 * @param  $html 
 *
 * @return 
 */
function wp_kama_woocommerce_before_widget_product_review_list_filter( $html ){

	// filter...
	return $html;
}

$html

-

Where the hook is called

echo wp_kses_post( apply_filters( 'woocommerce_before_widget_product_review_list', '<ul class="product_list_widget">' ) );

Where the hook is used in WooCommerce