<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  $x = $_POST['x'];
  $y = $_POST['y'];

  // Code to process form data goes here

  // Include file after form submission
  include($_SERVER['DOCUMENT_ROOT'] . '/life/submit.php');
}
else {
  // Include form file before form submission
  include($_SERVER['DOCUMENT_ROOT'] . '/life/form.php');
}

// Output any data or variables needed after form submission or form display
echo $table_data;
?>

<form method="post" action=""> 
  <input type="hidden" name="x" id="hiddenX" value="">
  <input type="hidden" name="y" id="hiddenY" value="">
  <button class="button1" type="submit" name="submit-life">คำนวณ</button> 
</form>