AnsPress_Category::ap_main_questions_args( array $args )

	public static function ap_main_questions_args( $args ) {
		global $wp;
		$query = $wp->query_vars;

		$categories_operator = ! empty( $wp->query_vars['ap_categories_operator'] ) ? $wp->query_vars['ap_categories_operator'] : 'IN';
		$current_filter = ap_get_current_list_filters( 'category' );

		if ( isset( $query['ap_categories'] ) && is_array( $query['ap_categories'] ) ) {
			$args['tax_query'][] = array(
				'taxonomy' => 'question_category',
				'field'    => 'slug',
				'terms'    => $query['ap_categories'],
				'operator' => $categories_operator,
			);
		} elseif ( ! empty( $current_filter ) ) {
			$args['tax_query'][] = array(
				'taxonomy' => 'question_category',
				'field'    => 'term_id',
				'terms'    => explode( ',', sanitize_comma_delimited( $current_filter ) ),
			);
		}

		return $args;
	}