会话变量并置于if else下

Question

这段代码有问题吗？当otp！= rand时，页面往往显示echo "<script>alert('Too many failures. Please login again.'); location.href='login.php';</script>";即使尝试＆lt; 3.我该如何解决这个问题？ ：（

if ($otp == $rand) {
//$query = "SELECT * FROM user WHERE user_id='$user_id' AND otp='$otp'";
//$result = mysqli_query($link, $query) or die(mysqli_error($link));
echo "<script>location.href='viewAccountBalance.php'</script>";
} 

else if ($otp != $rand)  {
  $_SESSION['attempts']++;
  if ($_SESSION['attempts'] < 3){
       echo "<script>alert('You have keyed in an invalid iBanking OTP. Please try again.');location.href='loginOtp.php'</script>";
  } 
  else{
       echo "<script>alert('Too many failures. Please login again.'); location.href='login.php';</script>";
  }
}
}

Answer 1

试试这个，

$_SESSION['attempts'] = $_SESSION['attempts']+1;

Answer 2

这也发生在我身上。我不知道会发生这种情况，但这对我有用

$_SESSION['attempts']++;

到

$_SESSION['attempts'] = $_SESSION['attempts'] + 1;