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<?php 

class Account {
  private $balance;
  
  public function setBalance($balance) {
    if ($balance >= 0) {
      $this->balance = $balance;
    }
  }
  
  public getBalance() {
    return $this->balance;
  }
}

$acc = new Account();
$acc->balance = 400;
print_r($acc);
$acc->setBalance(400);
print_r($acc->getBlance());
?>