I have a site where I make a payment, a bill is created through it, but the problem is that I can not use $ _POST twice in one, and this example:
    <?  if (isset($_POST['submit'])) { ?>
        <form action="" method="POST" >
              <input name="invoice" value="" type="text" />
              <input name="pay" value="Pay Now" type="submit" />
        </form>
<? }   if (isset($_POST['pay'])) {
        // MY QUERY HERE
        // HEADERS HERE
} else { ?>
<form action="" method="POST" >
    <input name="info" value="" type="text" />
    <input name="submit" value="Submit" type="submit" />
</form>  
<?  } ?>
 
     
    