Fatal error: Uncaught TypeError: Unsupported operand types: string * int

i have problem in here, can you help me fix it...

Fatal error: Uncaught TypeError: Unsupported operand types: string * int in C:\xampp\htdocs\nie\configuration\config_time.php:15 Stack trace: #0 C:\xampp\htdocs\nie\op.php(33): login_validate() #1 {main} thrown in C:\xampp\htdocs\nie\configuration\config_time.php on line 15  

line 15

$sessiontime = $sessiontime * 60;  

full code

<?php     function login_validate() {  error_reporting(0);   include 'configuration/config_connect.php';            $sessiontime = "";                    $queryback="SELECT * FROM backset";          $resultback=mysqli_query($conn,$queryback);          $rowback=mysqli_fetch_assoc($resultback);          $sessiontime=$rowback['sessiontime'];                  if($sessiontime != null || $sessiontime != "" || $sessiontime != 0 || $sessiontime != "" || $sessiontime > 0){      $sessiontime = $sessiontime * 60;      $timer = $sessiontime;  }else{        $timer=3600;  }       $_SESSION["expires_by"] = time() + $timer;  }  function login_check() {  $exp_time = $_SESSION["expires_by"];  if (time() < $exp_time) {  login_validate();  return true;  }else{  unset($_SESSION["expires_by"]);  return false;  }  }      ?>  

https://stackoverflow.com/questions/66538733/fatal-error-uncaught-typeerror-unsupported-operand-types-string-int March 09, 2021 at 07:33AM