rogiivs

<?php
error_reporting(E_ALL);
# error_reporting(E_ALL & ~E_NOTICE);
ini_set('display_errors', 'on');
setlocale(LC_ALL, 'ru_RU.UTF-8');
#-------------------------------------------------
$operations = ['+', '-', '*', '/'];

$numb1 = 0;
$numb2 = 0;

If (!empty($_POST['num1']) && !empty($_POST['num2'])) {
  if (in_array($_POST['oper'], $operations)) {

    $numb1 = +$_POST['num1'];
    $numb2 = +$_POST['num2'];

      switch ($_POST['oper']) {
        case '+':
          $res = $numb1 + $numb2;
        break;
        case '-':
          $res = $numb1 - $numb2;
        break;
        case '*':
          $res = $numb1 * $numb2;
        break;
        case '/':
          $res = $numb1 / $numb2;
        break;
        default:
          echo "НЕДОПУСТИМОЕ ДЕЙСТВИЕ";
      }
  }else{
    $res = "Ошибка операции";
  }
}
?>

<form action='calc.php' method="post">
      <label>Число 1:</label>
      <br />
      <input name='num1' type='number' value="<?=$numb1 ?>" />
      <br />
      <label>Оператор: </label>
      <br />
      <select name="oper">
          <?php foreach ($operations as $oper): ?>
        <option value="<?= $oper;?>"><?=$oper;?></option>
          <?php endforeach;?>
      </select>
    <br />
      <label>Число 2: </label>
      <br />
      <input name='num2' type='number' value="<?=$numb2 ?>" />
      <br />
      <?php if (isset($res)): ?>
      <p> Результат: <?=$res?></p>
      <?php endif;?>
      <br />
      <input type='submit' value='Считать'>
    </form>

$agentId = "2323";
$orderId = "777";
$agentTime = date("H:i:s d.m.y") ;
$amount = "25";
$phone = "79090000111";

$sign = md5("$agentId#$orderId#$agentTime#$amount#$phone");

$agentId = "2323";
$orderId = "777";
$agentTime = date("H:i:s d.m.y") ;
$amount = "25";
$phone = "79090000111";
$token = md5("<token>");

$sign = md5("$agentId#$orderId#$agentTime#$amount#$phone#$token");