Select post types and show related term and categories from the current shown post.

Related-Terms-and-Category-Add-on.php

<?php
/*
Plugin Name: Related Terms and Category Add-on
Plugin URI: http://tiptoppress.com/downloads/term-and-category-based-posts-widget/
Description: Add-on to select related terms and categories for the premium widget Term and Category Based Posts Widget.
Author: TipTopPress
Version: 0.2
Author URI: http://tiptoppress.com
*/
namespace termCategoryPostsPro\RelatedAddon;

// Don't call the file directly
if ( !defined( 'ABSPATH' ) ) exit;
/**
 *  Applied to the list of sort orders some new ones.
 *  
 *  @return array of sort orders
 *  
 *  @since 0.1
 */
function query_args ( $query_args, $that, $instance ) {

	$possible_sorts = array(
		'date'          => esc_html__( 'Latest', 'categorypostspro' ),
		'comment_count' => esc_html__( 'Have more comments', 'categorypostspro' ),
		'rand'          => esc_html__( 'Random', 'categorypostspro' ),
	);
	$possible_sorts = apply_filters( 'cpwp_possible_sorts', $possible_sorts, $that, $instance );

	if ( ! isset( $instance['sort_by'] ) ) {
		$instance['sort_by'] = 'date';
	}

	if ( isset( $instance['sort_by'] ) && array_key_exists( $instance['sort_by'], $possible_sorts ) ) {
		$sort_by = $instance['sort_by'];
	} else {
		$sort_by = 'date';
	}

	$sort_order = ( isset( $instance['asc_sort_order'] ) && $instance['asc_sort_order'] ) ? 'ASC' : 'DESC';
	$sort_order = apply_filters( 'cpwp_sort_order', $sort_order, $that, $instance );

	// Exclude current post.
	$exclude_current_post = '';
	if ( ( is_single() || is_singular() ) && ( isset( $instance['exclude_current_post'] ) && $instance['exclude_current_post'] ) ) {
		$exclude_current_post = get_the_ID();
	}

	$term_query = null;
	if ( isset( $instance['terms'] ) ) {
		foreach ( $instance['terms'] as $tax => $terms ) {
			$include_children = true;
			if ( isset( $instance['no_child_terms'][ $tax ] ) && $instance['no_child_terms'][ $tax ] ) {
				$include_children = false;
			}
			if ( null === $term_query ) { // the relationship setting need to be done only once.
				$term_query = array( 'relation' => 'OR' );
				if ( isset( $instance['tax_and_relationship'] ) && $instance['tax_and_relationship'] ) {
					$term_query = array( 'relation' => 'AND' );
				}
			}
			$operator = 'IN';
			if ( isset( $instance['tax_term_inclusion'][ $tax ] ) ) {
				if ( 'all' === $instance['tax_term_inclusion'][ $tax ] ) {
					$operator = 'AND';
				} elseif ( 'none' === $instance['tax_term_inclusion'][ $tax ] ) {
					$operator = 'NOT IN';
				}
			}
			if ( isset( $instance['show_terms_randomly'][ $tax ] ) && $instance['show_terms_randomly'][ $tax ] ) {
				if ( in_array( '0', $instance['terms'][ $tax ], true ) ) {
					$terms = get_terms( $tax, $args );
					$terms = $terms[ array_rand( $terms, 1 ) ]->term_id;
				} else {
					$terms = $terms[ array_rand( $terms, 1 ) ];
				}
			}
			$related_terms = get_the_terms(get_the_ID(), $tax);
			$related_terms_id = array();
			if ($related_terms) {
				foreach ($related_terms as $related_term) {
					$related_terms_id[] = $related_term->term_id;
				}
			}
			$term_query[] = array(
				'taxonomy'         => $tax,
				'field'            => 'term_id',
				'terms'            => array_merge($terms, $related_terms_id), // custom query: AND Same Category
				'include_children' => $include_children,
				'operator'         => $operator,
			);
		}
	}

	// Get array of post info.
	if ( isset( $instance['num'] ) ) {
		$args['showposts'] = (int) $instance['num'];
	}

	$args = array(
		'orderby'             => $sort_by,
		'order'               => $sort_order,
		'ignore_sticky_posts' => 1, // Make sure we do not get stickies out of order.
	);

	if ( is_array( $term_query ) ) {
		$args['tax_query'] = $term_query;
	}

	if ( $exclude_current_post ) {
		$args['post__not_in'] = array( $exclude_current_post );
	}

	if ( array_key_exists( 'authors', $instance ) && is_array( $instance['authors'] ) && ! in_array( '0', $instance['authors'], true ) ) { // if not default authors.
		$args['author'] = join( ',', $instance['authors'] );
	}

	if ( array_key_exists( 'post_types', $instance ) && is_array( $instance['post_types'] ) && ! in_array( '0', $instance['post_types'], true ) ) { // if not default post_type.
		$args['post_type'] = $instance['post_types'];
	} else {
		$args['post_type'] = 'any';
	}

	if ( isset( $instance['num'] ) ) {
		$args['showposts'] = (int) $instance['num'];
	}

	if ( isset( $instance['offset'] ) && ( (int) $instance['offset'] > 1 ) ) {
		$args['offset'] = (int) $instance['offset'] - 1;
	}

	if ( is_singular() && isset( $instance['exclude_current_post'] ) && $instance['exclude_current_post'] ) {
		$args['post__not_in'] = array( get_the_ID() );
	}

	$non_default_valid_status = array(
		'publish',
		'future',
		'publish,future',
		'private',
		'private,publish',
		'private,publish,future',
	);
	if ( isset( $instance['status'] ) && in_array( $instance['status'], $non_default_valid_status, true ) ) {
		$args['post_status'] = $instance['status'];
	}
	if ( isset( $instance['post_types'] ) && in_array( 'attachment', $instance['post_types'], true )  ) {
		$args['post_status'] .= ',inherit'; // used for media/attachments
	}

	if ( isset( $instance['hideNoThumb'] ) && $instance['hideNoThumb'] ) {
		$args = array_merge(
			$args, array(
				'meta_query' => array(
					array(
						'key'     => '_thumbnail_id',
						'compare' => 'EXISTS',
					),
				),
			)
		);
	}

	return $args;
}

add_filter( 'cpwp_query_args', __NAMESPACE__.'\query_args', 10, 3 );