previous wek number

hi guys

how can i get the last week number. for example this week is 13 how can i get last weeks (12).

i have tried the following but give me 13 still.


$today = date("W");
$today_2 = '1';
echo $prev_week_number = $today - $today2;


thanks in advance

sorry guys fixed it, spelling erro on the variable.

echo date('W',strtotime('last week'));

will work :)