Integrating Google Captcha

By Dag J, on September 12th, 2018

I've usually written my own code for captcha and bot intervention, but google is making it very easy now.

Google's own documentation - Just click on "My reCAPTCHA" to create one.

Client-side HTML

Inside HEAD: 
<script src='https://www.google.com/recaptcha/api.js'></script>

Inside FORM (method POST):
<div class="g-recaptcha" data-sitekey="YOUR-KEY"></div>

Server-side PHP (POST action)

// Sjekk captcha først.
isset($_POST['g-recaptcha-response'])) {
	$google_captcha_response = file_get_contents(
		"https://www.google.com/recaptcha/api/siteverify".
		"?secret=YOUR-KEY".
		"&response=". $_POST['g-recaptcha-response'] .
		"&remoteip=". $_SERVER['REMOTE_ADDR']
	);
	$success_result = json_decode($google_captcha_response, true);
	if ($success_result['success'] != true)
		exit('Confirm that you\'re not a robot... <a href="javascript:history.back()">Try again</a>');
	
	// Human verified, continue...
}