pagina1.html
codice:
<form action="pagina2.php" method="POST">
  <input type="checkbox" name="test" value="1">
  <input type="submit" name="vai" value="Vai">
</form>
pagina2.php
codice:
if(isset($_POST['test'])) {
    echo "checked";
} else {
    echo "not checked";
}