fork download
copy 
  1. <?php
  2. $operations = ['+', '-', '*', '/'];
  3. $op1 = null;
  4. $op2 = null;
  5. if (isset($_POST['op1']) && isset($_POST['op2'])) {
  6.    if (in_array($_POST['op'], $operations)) {
  7.         $op1 = (float)$_POST['op1'];
  8.         $op2 = (float)$_POST['op2'];
  9.         switch ($_POST['op']){
  10.             case '+':
  11.                 $res = $op1 + $op2;
  12.                 break;
  13.             case '-':
  14.                 $res = $op1 - $op2;
  15.                 break;
  16.             case '*':
  17.                 $res = $op1 * $op2;
  18.                 break;
  19.             case '/':
  20.                  if ($op2 == 0) {
  21.                  echo 'На ноль делить нельзя!';
  22.                  break;
  23.                  } else $res = $op1 / $op2;
  24.                 break;
  25.         }
  26.    } else {
  27.        $res = 'error!';
  28.     }
  29. }?>
  30. <!DOCTYPE html>
  31. <html lang="en">
  32. <head>
  33.     <meta charset="UTF-8">
  34.     <title>Calculator</title>
  35. </head>
  36. <body>
  37. <form action="calc.php" method="post">
  38.     <input type="text" name="op1" value="<?php echo $op1; ?>"/>
  39.     <select name="op">
  40.         <?php foreach ($operations as $op): ?>
  41.             <option value="<?php echo $op; ?>"><?php echo $op; ?></option>
  42.         <?php endforeach; ?>
  43.     </select>
  44.     <input type="text" name="op2" value="<?php echo $op2; ?>"/>
  45.     <br>
  46.     <?php if(isset($res)): ?>
  47.         <p>Result: <?php echo $res; ?></p>
  48.     <?php endif; ?>
  49.     <input type="submit" value="calc!" />
  50. </form>
  51. </body>
  52. </html>
Success #stdin #stdout 0.02s 52432KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Calculator</title>
</head>
<body>
<form action="calc.php" method="post">
    <input type="text" name="op1" value=""/>
    <select name="op">
                    <option value="+">+</option>
                    <option value="-">-</option>
                    <option value="*">*</option>
                    <option value="/">/</option>
            </select>
    <input type="text" name="op2" value=""/>
    <br>
        <input type="submit" value="calc!" />
</form>
</body>
</html>
https://ideone.com/D6YrkC
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!