Loop Row with Colum Bootstrap - PHP

Loop Row with Colum Bootstrap.php

<?php
//Columns must be a factor of 12 (1,2,3,4,6,12)
$numOfCols = 4;
$rowCount = 0;
$bootstrapColWidth = 12 / $numOfCols;
?>
<div class="row">
<?php
foreach ($rows as $row){
?>  
        <div class="col-md-<?php echo $bootstrapColWidth; ?>">
            <div class="thumbnail">
                <img src="user_file/<?php echo $row->foto; ?>">
            </div>
        </div>
<?php
    $rowCount++;
    if($rowCount % $numOfCols == 0) echo '</div><div class="row">';
}
?>
</div>