What are some alternative captcha solutions in PHP that are recommended?

One alternative captcha solution in PHP that is recommended is using Google reCAPTCHA. This service provides a more user-friendly experience by presenting users with a simple checkbox to confirm they are not a robot. It also offers better security against automated attacks compared to traditional image-based captchas. 

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

// Verify the user's response with Google reCAPTCHA
$response = $_POST['g-recaptcha-response'];
$remoteIP = $_SERVER['REMOTE_ADDR'];
$recaptchaUrl = "https://www.google.com/recaptcha/api/siteverify?secret=$secretKey&response=$response&remoteip=$remoteIP";
$recaptchaResponse = json_decode(file_get_contents($recaptchaUrl));

if (!$recaptchaResponse->success) {
    // Captcha verification failed
    // Handle the error accordingly
} else {
    // Captcha verification successful
    // Proceed with the form submission
}

Keywords

captcha PHP alternative solutions recommended libraries

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