Passing variable from javascript to PHP

[lekkie]

How can I pass a variable (form value variable) to a php script.

I tried passing the variable this way ($voucher = $_POST['voucher']) . where voucher is the name of the text form.

but it didn't work.

[devinemke]

a simple example:

<?php
if (!isset($_POST['submit']))
{
	echo '
	<form action="" method="POST">
	voucher: <input type="text" name="voucher"><br>
	<input type="submit" name="submit" value="submit">
	</form>
	';
}
else
{
	echo 'voucher = ' . $_POST['voucher'];
}
?>