Foreach looping Bootstrap columns in PHP

How to Loop rows with Bootstrap in PHP with examples?

//Get DATA using PDO
$query = $conn->prepare('SELECT * FROM table_name WHERE CONDITION ORDER BY RAND() LIMIT 12');
$query->execute();
$result = $query->fetchAll();

//Columns must be a factor of 12 (1,2,3,4,6,12)
$numOfCols = 3;
$rowCount = 0;
$bootstrapColWidth = 12 / $numOfCols;
$arrayCount = count($rows);
?>
<div class="row">
<?php
    foreach ($result as $row){
?>  
        <div class="col-md-<?php echo $bootstrapColWidth; ?>">
              <?php echo $row['...']; ?>
	</div>
	<?php
	$rowCount++;
	if($rowCount % $numOfCols == 0 && $rowCount < $arrayCount) {
		echo '</div><div class="row">';
	}
}
?>
</div>

or because of Bootstrap works within a 12 col grid system automatically, the code below provides 3 per row automatically since 12 / 4 = 3

<div class="row">
    <?php foreach ($rows as $row):?>
        <div class="col-md-4">
            DATA
        </div>
    <?php endforeach;?>
</div>

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