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  1. <?php
  2. $discount = 0;
  3. $final_price = 0;
  4.  
  5. if ($_SERVER["REQUEST_METHOD"] == "POST") {
  6.     $price = floatval($_POST['price']);
  7.  
  8.     if ($price >= 5000 && $price <= 10000) {
  9.         $discount = 3;
  10.     } elseif ($price > 10000 && $price <= 20000) {
  11.         $discount = 5;
  12.     } elseif ($price > 20000) {
  13.         $discount = 10;
  14.     }
  15.  
  16.     $discount_amount = ($price * $discount) / 100;
  17.     $final_price = $price - $discount_amount;
  18. }
  19. ?>
  20.  
  21. <!DOCTYPE html>
  22. <html>
  23. <head>
  24.     <title>คำนวณส่วนลดสินค้า</title>
  25. </head>
  26. <body>
  27.     <h2>โปรแกรมคำนวณส่วนลดสินค้า</h2>
  28.     <form method="post" action="">
  29.         <label for="price">ราคาสินค้า (บาท):</label>
  30.         <input type="number" name="price" id="price" required>
  31.         <button type="submit">คำนวณ</button>
  32.     </form>
  33.  
  34.     <?php if ($_SERVER["REQUEST_METHOD"] == "POST") : ?>
  35.         <h3>ผลลัพธ์:</h3>
  36.         <p>ราคาสินค้า: <?php echo number_format($price, 2); ?> บาท</p>
  37.         <p>ส่วนลด: <?php echo $discount; ?>% (<?php echo number_format($discount_amount, 2); ?> บาท)</p>
  38.         <p>ราคาสุทธิหลังหักส่วนลด: <?php echo number_format($final_price, 2); ?> บาท</p>
  39.     <?php endif; ?>
  40. </body>
  41. </html>
  42.  
Success #stdin #stdout #stderr 0.03s 25892KB
comments (?)
stdin 
Standard input is empty
stdout 
<!DOCTYPE html>
<html>
<head>
    <title>คำนวณส่วนลดสินค้า</title>
</head>
<body>
    <h2>โปรแกรมคำนวณส่วนลดสินค้า</h2>
    <form method="post" action="">
        <label for="price">ราคาสินค้า (บาท):</label>
        <input type="number" name="price" id="price" required>
        <button type="submit">คำนวณ</button>
    </form>
    
    </body>
</html>
stderr 
PHP Notice:  Undefined index: REQUEST_METHOD in /home/oiTXN8/prog.php on line 5
PHP Notice:  Undefined index: REQUEST_METHOD in /home/oiTXN8/prog.php on line 34
https://ideone.com/Ts0e4i
language:
PHP (php 7.3.5)
created:
284 days ago
visibility:
public

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