"All-in-One Event Calendar" filter_by_terms AND/OR

function filter_by_terms( $post_ids, $term_ids )
{
        global $wpdb;

        // ===============================================
        // = Sanitize provided IDs against SQL injection =
        // ===============================================
        if( ! is_array( $post_ids ) )
            $post_ids = explode( ',', $post_ids );
        foreach( $post_ids as &$post_id ) {
            $post_id = intval( $post_id );
        }
        $post_ids = join( ',', $post_ids );

        if( ! is_array( $term_ids ) )
            $term_ids = explode( ',', $term_ids );
        foreach( $term_ids as &$term_id ) {
            $term_id = intval( $term_id );
        }

        $eventTaxonomy = $wpdb->get_results( "SELECT term_id, taxonomy FROM $wpdb->term_taxonomy WHERE taxonomy like 'events%'", OBJECT_K );

        foreach ($term_ids as $termID) {
            $taxoIDs[$eventTaxonomy[$termID]->taxonomy][$termID] = $termID;
        }

        $args['post_type'] = 'ai1ec_event';
        $args['post_status'] = 'published';
        $args['posts_per_page'] = 999;
        $args['tax_query']['relation'] = 'AND';

        if ( !empty($taxoIDs['events_tags']) ) {
            $args['tax_query'][0]['taxonomy'] = 'events_tags';
            $args['tax_query'][0]['field'] = 'id';
            $args['tax_query'][0]['terms'] = $taxoIDs['events_tags'];
            $args['tax_query'][0]['operator'] = 'AND';
        }

        if ( !empty($taxoIDs['events_categories']) ) {
            $args['tax_query'][1]['taxonomy'] = 'events_categories';
            $args['tax_query'][1]['field'] = 'id';
            $args['tax_query'][1]['terms'] = $taxoIDs['events_categories'];
            $args['tax_query'][1]['operator'] = 'IN';
        }

        $events = new WP_Query( $args );

        return $wpdb->get_col( $events->request );
}