WordPress Related Posts Tutorial, Part 3

related-posts-tutorial-03.php

<?php
function jr3_get_related_posts( $post_id = 0, $args = array(), $count = 3 ) {
	
	
	/* 
	 * NOTE: This is a portion of a tutorial:
	 *
	 * @link https://johnregan3.wordpress.com/how-to-get-wordpress-related-posts
	 */

	unset( $args['tax_query'] );
	
	// THIS IS THE NEW CODE
	$posts = jr3_related_posts_get( $args, $posts );
	
	if ( ! empty( $posts ) && count( $posts ) >= $count ) {
		$posts = array_slice( $posts, 0, $count );
		return $posts;
	}
	
	// Since we're not doing any more queries, return what we have.
	if ( ! empty( $posts ) ) {
		return array_slice( $posts, 0, $count );
  	}
  
	// Make sure we don't exceed the number of $count.
	return array_slice( $posts, 0, $count );
}

/**
 * Get some posts using the provided $args.
 *
 * @since 1.0.0
 *
 * @param array $args  An array of \WP_Query args.
 * @param array $posts An array of posts.
 *
 * @return array An updated array of posts.
 */
function jr3_related_posts_get( $args, $posts = array() ) {
	$query = new WP_Query( $args );
	if ( ! empty( $query->posts ) && is_array( $query->posts ) ) {
		$new_posts = $query->posts;
		$posts = $posts + $new_posts;
	}
	return $posts;
}