php - Use twitter bootstrap span in foreach -

how use twitter spans within foreach loop?

this code:

<div class="row-fluid">     <?foreach ($photos $photo) { ?>         <div class="span4">             stuff         </div>     <? }?> </div>

but problem 4th output (which on 2nd row) off center - due margin/padding left.

i'm trying avoid having add counter , manually insert new 'row' after each 3rd loop - surely there cleaner way via bootstrap/css?

by using css3's nth-child selector, can target elements using math.

.span4:nth-child(3n+1) {     /* css here */ }

the 3n+1 math function n incrementing 1, target elements #1 (3x0 + 1), #4 (3x1 + 1), #7 (3x2 + 1), etc.

Live