<form method="POST" action="#"> Enter The Amount To Transfer: <input type="text" name="withdraw_amount" required>$<br> <input type="submit" name="submit" value="Transfer"> </form> </body> </html> <?php if (isset($_POST['submit'])) { $amount = $_POST['withdraw_amount']; class BankAccount { public $balance = 1000; public function DisplayBalance() { return $this->balance; } public function WithdrawFunds($amount) { if ($this->balance < $amount) { echo 'Sorry ! Not Sufficient Balance'; die; } else { $this->balance = $this->balance - $amount; } } } $account = new BankAccount(); $account->WithdrawFunds($amount); echo 'Transferred Successfully ! Your Current Balance is :' . $account->DisplayBalance() . '$'; }