php date format YYYY-MM-DD minus or add one week from now?

Question

today 22-05-2011 so it should be 29-05-2011? ( plus 1 week ) 
or
today 22-05-2011 so it should be 15-05-2011? ( minus 1 week ) 

thanks for looking

Answer 1

strtotime will handle this.

$pDate = strtotime('22-05-2011 + 1 week');
echo date('d-m-Y',$pDate);

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Added: This is if you want to start from a specific date. If you just want 'today' +/- a week', mark JohnP's answer as correct. : )