Add excerpt to results from Google Analytics Top Content Widget

gtc_list_item_add_excerpt.php

<?php
/**
 * Add the post excerpt to the results in the Google Analytics Top Content Widget.
 *
 * @param  string       $item_html The item html.
 * @param  array        $page      The page result object from Google Analytics.
 * @param  WP_Post|null $wppost    The WordPress post object (if we have it).
 *
 * @return string       The modified item html.
 */
function gtc_list_item_add_excerpt( $item_html, $page, $wppost ) {
	$excerpt = '';

	if ( isset( $wppost->ID ) ) {
		if ( ! empty( $wppost->post_excerpt ) ) {

			$excerpt = wp_kses_post( $wppost->post_excerpt );

		} elseif ( ! empty( $wppost->post_content ) ) {

			$text = strip_shortcodes( $wppost->post_content );

			/** This filter is documented in wp-includes/post-template.php */
			$text = apply_filters( 'the_content', $text );
			$text = str_replace(']]>', ']]&gt;', $text);

			/**
			 * Filters the number of words in an excerpt.
			 *
			 * @since 2.7.0
			 *
			 * @param int $number The number of words. Default 55.
			 */
			$excerpt_length = apply_filters( 'excerpt_length', 55 );
			/**
			 * Filters the string in the "more" link displayed after a trimmed excerpt.
			 *
			 * @since 2.9.0
			 *
			 * @param string $more_string The string shown within the more link.
			 */
			$excerpt_more = apply_filters( 'excerpt_more', ' ' . '[&hellip;]' );
			$excerpt = wp_kses_post( wp_trim_words( $text, $excerpt_length, $excerpt_more ) );
		}
	}

	// Make a place for the excerpt
	$format = str_replace( '</li>', $excerpt . '</li>', $format );

	return $item;
}
add_filter( 'gtc_list_item', 'gtc_list_item_add_excerpt', 10, 6 );