Writing and Reading an Array from a Session.

I have the following array

<?php foreach ($order->getItems() as $item) { ?>
    "<?php echo $data['orderNumber']?>", 
    "<?php echo $item->getProductNumber()?>", 
    "<?php echo $item->getName()?>", 
    "<?php echo $item->getUnitPrice()?>",    
    "<?php echo $item->getQuantity()?>"                                      
<?php } ?>

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I need help writing the follow information into a session and then reading the same info from a session.

I tried using

$_SESSION['neworders']=$order; 

PHP:

but that didn't work.

The array can contain one product or multiple products.

 

To add to session:

$_SESSION['neworders'] = serialize($order);

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to get back from session

$order = unserialize($_SESSION['neworders']);

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And don't forget to put this line before any output is sent to browser:

session_start();

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AsHinE why always before me