magento var and mysql log cleanup script

<?php

// cleanup.php?clean=var
// cleanup.php?clean=log

$xml = simplexml_load_file('./app/etc/local.xml', NULL, LIBXML_NOCDATA);

$db['host'] = $xml->global->resources->default_setup->connection->host;
$db['name'] = $xml->global->resources->default_setup->connection->dbname;
$db['user'] = $xml->global->resources->default_setup->connection->username;
$db['pass'] = $xml->global->resources->default_setup->connection->password;
$db['pref'] = $xml->global->resources->db->table_prefix;

if($_GET['clean'] == 'log') clean_log_tables();
if($_GET['clean'] == 'var') clean_var_directory();

function clean_log_tables() {
	global $db;
	
	$tables = array(
		'dataflow_batch_export',
		'dataflow_batch_import',
		'log_customer',
		'log_quote',
		'log_summary',
		'log_summary_type',
		'log_url',
		'log_url_info',
		'log_visitor',
		'log_visitor_info',
		'log_visitor_online',
		'index_event',
		'report_event',
		'report_compared_product_index',
		'report_viewed_product_index',
		'catalog_compare_item',
		'catalogindex_aggregation',
		'catalogindex_aggregation_tag',
		'catalogindex_aggregation_to_tag'
	);
	
	mysql_connect($db['host'], $db['user'], $db['pass']) or die(mysql_error());
	mysql_select_db($db['name']) or die(mysql_error());
	
	foreach($tables as $v => $k) {
		@mysql_query('TRUNCATE `'.$db['pref'].$k.'`');
	}
}

function clean_var_directory() {
	$dirs = array(
		'downloader/.cache/*',
		'downloader/pearlib/cache/*',
		'downloader/pearlib/download/*',
		'var/cache/',
		'var/locks/',
		'var/log/',
		'var/report/',
		'var/session/',
		'var/tmp/'
	);
	
	foreach($dirs as $v => $k) {
		exec('rm -rf '.$k);
	}
}