Insert back up database in a folder

Hi..
I've seen code for back up database but when I run the code the database was backup outside the folder. I want to put the back up database inside the folder
here is the code:

Code:

<?php
include 'config.php';
  backup_tables('localhost','root','','payroll');

/* backup the db OR just a table */
function backup_tables($host,$user,$pass,$name,$tables = '*')
{
    
    $link = mysql_connect($host,$user,$pass);
    mysql_select_db($name,$link);
    
    //get all of the tables
    if($tables == '*')
    {
        $tables = array();
        $result = mysql_query('SHOW TABLES');
        while($row = mysql_fetch_row($result))
        {
            $tables[] = $row[0];
        }
    }
    else
    {
        $tables = is_array($tables) ? $tables : explode(',',$tables);
    }
    
    //cycle through
    foreach($tables as $table)
    {
        $result = mysql_query('SELECT * FROM '.$table);
        $num_fields = mysql_num_fields($result);
        
        $return.= 'DROP TABLE '.$table.';';
        $row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table));
        $return.= "\n\n".$row2[1].";\n\n";
        
        for ($i = 0; $i < $num_fields; $i++) 
        {
            while($row = mysql_fetch_row($result))
            {
                $return.= 'INSERT INTO '.$table.' VALUES(';
                for($j=0; $j<$num_fields; $j++) 
                {
                    $row[$j] = addslashes($row[$j]);
                    $row[$j] = ereg_replace("\n","[URL="file://\\n",$row[$j"]\\n",$row[$j[/URL]]);
                    if (isset($row[$j])) { $return.= '"'.$row[$j].'"' ; } else { $return.= '""'; }
                    if ($j<($num_fields-1)) { $return.= ','; }
                }
                $return.= ");\n";
            }
        }
        $return.="\n\n\n";
    }
    
    //save file
    $myfoldername = "backup_DBPayroll";//your folders name 
    $handle = fopen(getcwd().$myfoldername.'db-backup-'.time().'-'.(md5(implode(',',$tables))).'.sql','w+');
    
   // $handle = fopen('db-backup-'.date('m-d-Y').'-'.(md5(implode(',',$tables))).'.sql','w+');
    fwrite($handle,$return);
    fclose($handle);
}

$smarty->display('header_cat.tpl');
$smarty->display('backup.tpl');
$smarty->display('footer.tpl');
?>

Thank you in advance