insert array into MySQL DB (unexpected T_STRING)

You don't need ' for null in your $sql1 statement:

Try:

$sql1[] = '(null, '.$row['cust_id'] ...

As Daniel A. White pointed out, your code is very susceptible to SQL injection, but here is a working version of the code you gave:

<?php

$max = count($_SESSION['cart']);
for($i = 0; $i < $max; $i++) {
    $pid = $_SESSION['cart'][$i]['productid'];
    $ppid = get_product_id($pid);
    $ppav = get_product_name($pid);
    $price = get_price($pid);
    $date = date('Y-m-d');
    $orderid = mysql_insert_id();
    $customerid = mysql_insert_id();

    $array['cust_id'] = $customerid;
    $array['prod_id'] = $ppid;
    $array['prod_name'] = $ppav;
    $array['price'] = $price;
    $array['date'] = $date;

    $sql1 = array();
    foreach($array as $row) {
        $sql1[] = '(NULL, '.$row['cust_id'].', '.$row['prod_id'].', "'.$row['prod_name'].'", ' . $row['price'] . ', "' . $row['date'] . '")';
    }
    mysql_query('INSERT INTO orders (id, cust_id, prod_id, prod_name, price, date) VALUES ' . implode(',',$sql1));

}
?>

Also, I would suggest getting a decent code editor, (I use Zend Studio which is a better version of the free Eclipse PDT) or at least one with error highlighting to prevent common errors like this.