How can PHP developers prevent automated attacks on contact forms by ensuring that POST requests are not generated by scripts?

To prevent automated attacks on contact forms by ensuring that POST requests are not generated by scripts, PHP developers can implement a CAPTCHA verification system. This will require users to verify that they are human before submitting the form, thereby reducing the likelihood of automated scripts submitting spam or malicious content. 

// Include the Google reCAPTCHA library
require_once('recaptchalib.php');

// Your site key and secret key from Google reCAPTCHA
$siteKey = 'YOUR_SITE_KEY';
$secret = 'YOUR_SECRET_KEY';

// Verify the reCAPTCHA response
$recaptcha = new ReCaptcha($secret);
$resp = $recaptcha->verify($_POST['g-recaptcha-response'], $_SERVER['REMOTE_ADDR']);

if (!$resp->isSuccess()) {
    // CAPTCHA verification failed, handle the error
    // For example, display an error message and prevent the form submission
    echo "CAPTCHA verification failed. Please verify that you are human.";
} else {
    // CAPTCHA verification successful, process the form submission
    // Your code to handle the form data goes here
}

Keywords

PHP contact form automated attacks POST requests scripts

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