Simple Shortcode to display a Featured Page or Post

shortcodes.php

<?php
/**
* This code adds a custom Shortcode to display a "Featured Post."
*/

function featuredpost_shortcode( $atts ) {

	// Var defaults
	$defaults['id'] = 1;
	$postID = '';
	$postTypesArray = array('post', 'page'); // add more post types here

	// Get Attributes from the Shortcode
	$scAtts = shortcode_atts( $defaults, $atts, 'theme_textdomain' );

	// If user has not provided an ID, exit
	if ( empty( $scAtts['id'] ) ) {
		return 'Please provide a Post ID.';
	}

	// Assign postID var
	$postID = (int)$scAtts['id'];

	// Create arguments for Query
	$args = array(
		'p'         => $postID,
		'post_type' => $postTypesArray
	);

	// The Query
	$the_query = new WP_Query( $args );

	ob_start();

	if ( $the_query->have_posts() ) {

		while ( $the_query->have_posts() ) {

			$the_query->the_post();

			// Get the featured post content
			$content = get_post_field( 'post_content', get_the_ID() );

			// Get content parts
			$content_parts = get_extended( $content );

			// Get all content before <!--more--> tag
			$real_excerpt = $content_parts['main'];

			// Display the Featured Post
			echo '<section class="featured-post widget featured-content post-' . get_the_ID() . ' type-' . get_post_type() . '">';
			echo '<div class="widget-wrap">';
			echo '<article class="entry">';
			echo '<div class="stripe"></div>';
			echo '<div class="wrapper">';
			echo '<a href="' . get_the_permalink() . '">' . get_the_post_thumbnail() . '</a>';
			echo '<header class="entry-header"><h4 class="entry-title" itemprop="headline"><a href="' . get_the_permalink() . '">' . get_the_title() . '</a></h4></header>';
			echo '<div class="entry-content">' . $real_excerpt . '<br><a href="' . get_the_permalink() . '" class="more-link">Learn More</a></div>';
			echo '</div>';
			echo '</article>';
			echo '</div>';
			echo '</section>';

		}

	} else {

		echo "Nothing found. Please check the Post ID and try again.";

	}

	$output = ob_get_contents();

	ob_end_clean();

	/* Restore original Post Data */
	wp_reset_postdata();

	return $output;

}
add_shortcode( 'featured-post', 'featuredpost_shortcode' );