Convert a date format in PHP

Question

I am trying to convert a date from yyyy-mm-dd to dd-mm-yyyy (but not in SQL); however I don\'t know how the date function requires a timestamp, and

Answer 1

Also another obscure possibility:

$oldDate = '2010-03-20'
$arr = explode('-', $oldDate);
$newDate = $arr[2].'-'.$arr[1].'-'.$arr[0];

I don't know if I would use it but still :)