Google Recaptcha v3 example demo

Question

Until now, I was working with Google Recaptcha v2, but now I want to update my WebApp using the lastest version (v3).

Is it possible to anyone add a fully working Go

Answer 1

Simple code to implement ReCaptcha v3

The basic JS code

The basic HTML code

    
    
    .... your fields

The basic PHP code

if (isset($_POST['g-recaptcha-response'])) {
    $captcha = $_POST['g-recaptcha-response'];
} else {
    $captcha = false;
}

if (!$captcha) {
    //Do something with error
} else {
    $secret   = 'Your secret key here';
    $response = file_get_contents(
        "https://www.google.com/recaptcha/api/siteverify?secret=" . $secret . "&response=" . $captcha . "&remoteip=" . $_SERVER['REMOTE_ADDR']
    );
    // use json_decode to extract json response
    $response = json_decode($response);

    if ($response->success === false) {
        //Do something with error
    }
}

//... The Captcha is valid you can continue with the rest of your code
//... Add code to filter access using $response . score
if ($response->success==true && $response->score <= 0.5) {
    //Do something to denied access
}

You have to filter access using the value of $response.score. It can takes values from 0.0 to 1.0, where 1.0 means the best user interaction with your site and 0.0 the worst interaction (like a bot). You can see some examples of use in ReCaptcha documentation.