I am trying to use a parameter that I pass to the page in an xpath query. This works properly (hard coded):

<?php
$xml = simplexml_load_file("bookstore.xml");

$res = $xml->xpath("/bookstore/book[title = 'Everyday Italian']"); 

echo $res[0]->author

?>

but I pass the parameter with:

bookdetails.php?title="Everyday Italian"

and then do:

<?php
$xml = simplexml_load_file("bookstore.xml");

$res = $xml->xpath("/bookstore/book[title = $_GET['title']]"); 

echo $res[0]->author

?>

I get a 500 error.

Any thoughts?

Thanks,

David