In the provided PHP code, what improvements or modifications can be made to enhance the overall functionality and reliability of the CAPTCHA verification process and email sending functionality?

Issue: The provided PHP code lacks proper error handling and validation for the CAPTCHA verification process and email sending functionality, which can lead to potential security vulnerabilities and unreliable user experience. To enhance the overall functionality and reliability, we can implement better error handling, input validation, and use a more secure method for sending emails. 

```php
// Improved PHP code with enhanced CAPTCHA verification and email sending functionality

// Validate CAPTCHA
$captcha_secret = "your_secret_key";
$captcha_response = $_POST['g-recaptcha-response'];
$verify_url = "https://www.google.com/recaptcha/api/siteverify?secret=$captcha_secret&response=$captcha_response";
$response = file_get_contents($verify_url);
$response_keys = json_decode($response, true);
if (!$response_keys['success']) {
    die("CAPTCHA verification failed. Please try again.");
}

// Validate email and message inputs
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);
$message = $_POST['message'];
if (!$email || empty($message)) {
    die("Invalid email or message input.");
}

// Send email
$to = "recipient@example.com";
$subject = "New message from website contact form";
$headers = "From: $email";
mail($to, $subject, $message, $headers);

echo "Email sent successfully!";
```

In the improved code snippet, we first validate the CAPTCHA response using Google reCAPTCHA API. We then validate the email and message inputs to ensure they are in the correct format. Finally, we send the email using the `mail()` function with proper headers. This enhanced code snippet improves the security and reliability of the CAPTCHA verification process and email sending functionality.

Keywords

CAPTCHA verification process email sending functionality reliability

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