Cacher is the code snippet organizer for pro developers

<?php

/**
 * Filter the post types to limit it to the same post type.
 *
 * @param array $post_types Array of post types included in WHERE clause
 * @return array Updated array of post types
 */
function crp_same_post_type( $post_types ) {
	global $post;

	$post_types = array(
		$post->post_type => $post->post_type
	);

	return $post_types;
}
add_filter( 'crp_posts_post_types', 'crp_same_post_type' );