google recaptcha驗證串接教學

下載recaptcha
https://github.com/google/recaptcha
載完之後放好就可以了，只要記得呼叫相對路徑就好

先引入https://www.google.com/recaptcha/api.js

function LoginForm(){
		wp_register_script('pm-google_script','https://www.google.com/recaptcha/api.js');
		wp_enqueue_script('pm-google_script');
	}

前端html加入

<div class="g-recaptcha" data-callback="captcha_onclick" data-sitekey="your sitekey" style="margin-top:50px;"></div>
				<input type="hidden" name="recaptcha" id="recaptchaValidator" />

js部分

function captcha_onclick() {
	document.getElementById('recaptchaValidator').value = grecaptcha.getResponse();
}

後端驗證時加入

require(PM_DIR.'/recaptcha/src/autoload.php');
//記得改成最前面那包recaptcha的相對路徑
		// _GOOGLE_RECAPTCHA_SEC_KEY 就是 google 給的 Secret Key
		$recaptcha = new \ReCaptcha\ReCaptcha('6LeXo70UAAAAAORn5xn-s9QFPvBwAj2xOQKXhY63');
		$gRecaptchaResponse = $_POST['recaptcha'];
		$remoteIp = $_SERVER['REMOTE_ADDR'];
		$resp = $recaptcha->verify($gRecaptchaResponse, $remoteIp);
		if(!$resp->isSuccess()){
			echo json_encode(array('error'=>'請先證明您不是機器人'));
			exit();
		}else{
                  //驗證成功時做的事情
                }

記得回傳失敗的時候需要做以下處理，否則登入失敗時驗證區塊會卡死

grecaptcha.reset();