How to update value in database using textfield

<!--php include('database.php'); session_start(); if (isset($_REQUEST['submit'])) { $password=$_POST['password']; $id=$_POST['id']; mysql_query ("UPDATE members SET sd_user_password='$password' WHERE sd_user_id= '".$_SESSION['id']."'"); header('Location: http://localhost/settings.php'); echo "data saved"; } else { ?--> <script type="text/javascript"> alert('Your password is not matched'); </script> <!--php } ?-->

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