Passing an Array in HTML

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I am reading a file into an array ($data_old = file("config.old");) and then
processing it as I receive information from the user.  As we all know, the
Internet is stateless, so I need to read back in the array after I get my
answer.

Array definitions are

$data_old = array();
$data_new = array();
$data_count = 0;

The output code is

echo "<P><input type='hidden' name='data_old' value='".$data_old."'>";
echo "<P><input type='hidden' name='data_old' value='".$data_new."'>";
echo "<P><input type='hidden' name='data_count' value=".$data_count.">";

and the input code is

$data_old = $_REQUEST['data_old'];
$data_new = $_REQUEST['data_new'];
$data_count = $_REQUEST['data_count'];

$data_count is working so I am assuming my problem is the way that I am
passing the array.  How can I pass an array or is it not possible?  I would
think that anything can be passed as it is just bits of data (pun intended).
So what goes out should come in.  But, for some reason, that is not
happening.

Any help, suggestions, and guidance is appreciated.

Mike

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