How can PHP be used to integrate Captcha into a form for enhanced security?

To integrate Captcha into a form for enhanced security, you can use PHP to generate a Captcha image and validate the user input against it. This helps prevent automated bots from submitting the form and adds an additional layer of security to your website. 

```php
<?php
session_start();

// Generate a random Captcha code
$captchaCode = substr(md5(rand()), 0, 6);
$_SESSION['captcha_code'] = $captchaCode;

// Create a Captcha image
$captchaImage = imagecreate(100, 30);
$bgColor = imagecolorallocate($captchaImage, 255, 255, 255);
$textColor = imagecolorallocate($captchaImage, 0, 0, 0);
imagestring($captchaImage, 5, 30, 10, $captchaCode, $textColor);

header('Content-type: image/png');
imagepng($captchaImage);
imagedestroy($captchaImage);
?>
```

In this code snippet, we first start a session to store the generated Captcha code. We then create a random Captcha code and save it in the session. Next, we generate a simple Captcha image with the code displayed on it. Finally, we output the Captcha image as a PNG file. This code can be integrated into a form where users have to enter the Captcha code to submit the form, thus enhancing security.

Keywords

PHP Captcha form integration security validation

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