Recaptcha for BuddyPress (Stop spammers)

functions.php

/**
RECAPTCHA
Stop wordpress with buddypress spam
Remember to replace "YOUR SECRET" and "YOUR SITE KEY".
**/

//these files are required, you can find it here:
//https://github.com/google/recaptcha
require_once __DIR__ . '/ReCaptcha/RequestMethod.php';
require_once __DIR__ . '/ReCaptcha/RequestMethod/Post.php';
require_once __DIR__ . '/ReCaptcha/Response.php';
require_once __DIR__ . '/ReCaptcha/RequestParameters.php';
require_once __DIR__ . '/ReCaptcha/ReCaptcha.php';

function bph_validate_captcha(){
	// Register API keys at https://www.google.com/recaptcha/admin
	$secret = 'YOUR SECRET';
	
	global $bp;
	if (isset($_POST['g-recaptcha-response'])):
		// If the form submission includes the "g-captcha-response" field
		// Create an instance of the service using your secret
		$recaptcha = new \ReCaptcha\ReCaptcha($secret);

		// Make the call to verify the response and also pass the user's IP address
		$resp = $recaptcha->verify($_POST['g-recaptcha-response'], $_SERVER['REMOTE_ADDR']);

		if ($resp->isSuccess()):
			// If the response is a success, that's it!
			//do nothing
		else:
			// If it's not successful, then one or more error codes will be returned.
			$bp->signup->errors['bph_field'] = __('This is a required field','buddypress');
		endif;
	else:
		$bp->signup->errors['bph_field'] = __('This is a required field','buddypress');
	endif;
	
	return;
}

function bph_show_captcha(){
?>
	<div style="clear:both; float: right;" class="bph_field_container">
		<div class="g-recaptcha" data-sitekey="YOUR SITE KEY"></div>
		<script type="text/javascript"
				src="https://www.google.com/recaptcha/api.js?hl=pt-BR">
		</script>
		<?php do_action( 'bp_bph_field_errors' ) ?>
	</div>
	<?php
}

add_action('bp_signup_validate', 'bph_validate_captcha');
add_action('bp_before_registration_submit_buttons', 'bph_show_captcha');