Validating form input data

Hello everyone,

I am tying to come up with an elegant way to process some input data that
come from a form. When the user hits the ‘Submit’ button, i want the form to
appear again with the already entered valid data filled in and prompt the
user to re-enter the non-valid data. If all data is valid, i will forward to
an other .php page which enters the data into a database.

I tried to do this in the following way: the form always hits back on
itself, but when all data is valid i use the PHP:header() to redirect to the
data.php that performs the database insertion. The problem is that the data
is not available to data.php in the $_POST variable. How can i overcome this
problem? Any other subtle way to handle the whole thing? Any help
appreciated.

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