Cant spot parse error

[Lassie]

I have constructed a link but have a parse error I cant solve.

The error is unexpected T_Constant_Encapsed_String

 

<?php
$product_id=13;
?>
<a href="<?php'show_book.php?product_id='.$product_id;?>">Order Now</a>

I know this is basic but any help gratefully received.

[rajivgonsalves]

you forgot the echo

 

<?php
$product_id=13;
?>
<a href="<?php echo 'show_book.php?product_id='.$product_id;?>">Order Now</a>

 

better still do it in this way

 

<?php
$product_id=13;
?>
<a href="show_book.php?product_id=<?php echo $product_id;?>">Order Now</a>

[Lassie]

Thanks Rajiv,

Couldn't see the woods for the trees!

[kratsg]

If you really want it shorter..

 

<a href="show_book.php?product_id=<?=$product_id ?>">Order Now</a>

 

Should work.