uninstall.php

<?php
global $wpdb, $orgseries;
$settings = $orgseries->settings;
$delete_series = $settings['kill_on_delete'];

if ( $delete_series == 1 ) {
	$query = "SELECT term_id FROM $wpdb->term_taxonomy WHERE taxonomy = '".ppseries_get_series_slug()."'";
	$series_ids = $wpdb->get_results($query);
	 foreach ( $series_ids as $series ) {
		$series = (int) $series->term_id;

		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d", $series ) );
		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->term_taxonomy WHERE term_taxonomy_id = %d", $series ) );
		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->terms WHERE term_id = %d", $series ) );
	}

	$meta_key = "'%_series_part%'";
	$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE meta_key LIKE %s", $meta_key) );
	$table_name = $wpdb->prefix . "orgseriesicons";
	$drop_query = "DROP TABLE ". $table_name;
	$wpdb->query( $drop_query );
	delete_option('org_series_options');
	delete_option('org_series_is_initialized');
	delete_option('org_series_version');
	delete_option('org_series_oldversion');
	delete_option('orgSeries_latest_series_widget');
	delete_option('orgSeries_widget');
	delete_option('series_icon_path');
	delete_option('series_icon_url');
	delete_option('series_icon_filetypes');
}

?>