get_the_excerpt( int|WP_Post $post = null )

function get_the_excerpt( $post = null ) {
	if ( is_bool( $post ) ) {
		_deprecated_argument( __FUNCTION__, 'WP-2.3.0' );
	}

	$post = get_post( $post );
	if ( empty( $post ) ) {
		return '';
	}

	if ( post_password_required( $post ) ) {
		return __( 'There is no excerpt because this is a protected post.' );
	}

	/**
	 * Filters the retrieved post excerpt.
	 *
	 * @since WP-1.2.0
	 * @since WP-4.5.0 Introduced the `$post` parameter.
	 *
	 * @param string $post_excerpt The post excerpt.
	 * @param WP_Post $post Post object.
	 */
	return apply_filters( 'get_the_excerpt', $post->post_excerpt, $post );
}