Create a PHP script to validate a credit card number.

SourceFusionHub · Oct 6, 2023 · 5cdb6cc · 5cdb6cc
1 parent 5552056
commit 5cdb6cc
Showing 1 changed file with 149 additions and 0 deletions.
diff --git a/K05E8i/1hpT9W.php b/K05E8i/1hpT9W.php
@@ -0,0 +1,149 @@
+<?php
+
+function validateCreditCard($cardNumber) {
+    $cardNumber = preg_replace('/\D/', '', $cardNumber);
+
+    if (!ctype_digit($cardNumber) || empty($cardNumber)) {
+        return "Invalid";
+    }
+
+    $reversedCardNumber = strrev($cardNumber);
+    $sum = 0;
+    $double = false;
+
+    for ($i = 0; $i < strlen($reversedCardNumber); $i++) {
+        $digit = intval($reversedCardNumber[$i]);
+
+        if ($double) {
+            $digit *= 2;
+
+            if ($digit > 9) {
+                $digit -= 9;
+            }
+        }
+
+        $sum += $digit;
+        $double = !$double;
+    }
+    return ($sum % 10 == 0) ? "Valid" : "Invalid";
+}
+
+$validationResult = null;
+
+if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST["cardNumber"])) {
+    $cardNumber = $_POST["cardNumber"];
+    $validationResult = validateCreditCard($cardNumber);
+}
+?>
+
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Credit Card Validation</title>
+    <style>
+      body {
+        font-family: Arial, sans-serif;
+        background-color: #f4f4f4;
+        display: flex;
+        justify-content: center;
+        align-items: center;
+        height: 100vh;
+        flex-direction: column;
+      }
+
+      h1 {
+        text-align: center;
+        color: #333;
+      }
+
+      form {
+        width: clamp(300px, 50vw, 600px); 
+        margin: 0 auto;
+        background: #fff;
+        padding: 20px;
+        border-radius: 5px;
+        box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
+        transition: all 0.3s ease-in-out;
+      }
+
+      form:hover {
+        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
+      }
+
+      label {
+        display: block;
+        margin-bottom: 5px;
+        font-weight: bold;
+      }
+
+      input[type="text"] {
+        background-color: #f4f4f4;
+        width: 95%;
+        padding: 10px;
+        margin-bottom: 10px;
+        border: 1px solid #ccc;
+        border-radius: 5px;
+        font-size: 1rem;
+      }
+
+      input[type="submit"] {
+        background-color: #007bff;
+        color: #fff;
+        padding: 10px 20px;
+        border: none;
+        border-radius: 5px;
+        cursor: pointer;
+        display: block;
+        margin: 0 auto;
+        transition: all 0.3s ease-in-out;
+        font-size: 1rem;
+        letter-spacing: 1px;
+        border: 2px solid #007bff;
+      }
+
+      input[type="submit"]:hover {
+        background-color: #ffffff;
+        color: #007bff;
+        border: 2px solid #007bff;
+      }
+
+      p {
+        font-weight: bold;
+        text-align: center;
+        margin-top: 15px;
+        color: #333;
+      }
+
+      .example {
+        color: rgba(0, 0, 0, 0.5)
+      }
+    </style>
+  </head>
+  <body>
+    <h1>Credit Card Validation</h1>
+    <form method="post" action="">
+      <label for="cardNumber">Enter a credit card number:</label>
+      <input type="text" name="cardNumber" id="cardNumber" required="" />
+      <input type="submit" value="Validate" />
+    </form>
+
+    <?php 
+        if ($validationResult !== null) { ?>
+    <p
+      style="color: <?php echo ($validationResult === 'Valid') ? 'green' : 'red'; 
+    ?>
+        "
+    >
+      <?php echo $validationResult; ?>
+      credit card number.
+    </p>
+    <?php 
+        } 
+    ?>
+
+    <div>
+        <p class="example">Example: This is a valid credit card number: <strong>4532015112830366</strong></p>
+    </div>
+
+  </body>
+</html>