$data = array();

for ($i = 0; $i < 100; $i++)
{

    $name = md5(rand(0, 1000));
    $price = rand(0, 1000);


    $data[] = array('name' => $name, 'price' => $price);
}

function placeholders($text, $count=0, $separator=",")
{
    $result = array();

    if($count > 0)
    {
        for($x=0; $x<$count; $x++)
        {
            $result[] = $text;
        }
    }

    return implode($separator, $result);
}

$db->beginTransaction();

$insert_values = array();
$datafields = array('name', 'price');
$question_marks = array();

foreach($data as $d)
{

    $question_marks[] = '('  . placeholders('?', sizeof($d)) . ')';
    $insert_values = array_merge($insert_values, array_values($d));
}

$sql = "INSERT INTO products (" . implode(",", array_values($datafields) ) . ") VALUES " . implode(',', $question_marks);


$stmt = $db->prepare($sql);

try
{
    $stmt->execute($insert_values);
}
catch (PDOException $e)
{

    out($e->getMessage());

}

$db->commit();