简单、友好、免费的验证码第三方服务商hcaptcha使用感受上比Google reCAPTCHA V2*/V3 使用体验更好。
目前hCaptcha是互联网占比到15%市场份额的独立验证码服务商。hCaptcha使用的机器学习技术，能够在保护隐私消耗少量资料的前提下，精确识别出典型的机器人行为，连Cloudflare都从Google reCAPTCHA更换到验证码厂商hCaptcha。
尽管hcaptcha验证形式只有图片辨认类型，没有国内滑块、旋转等验证码炫酷，但是免费可靠，使用简单，而且国内使用访问速度不错。
点击 “Sign Up Now” 注册hCaptcha hcaptcha在为阻档机器人访问的同时，还是顺便赚钱的验证码，如下，我刚挂一天，就有0.2776 HMT币。
hcaptcha验证码使用教程：
在网页中放置下面JS，<HEAD>前，或是 <BODY>中，都行
<script src="https://www.hCaptcha.com/1/api.js" async defer></script>
在表格上放置下面显示验证码的块：
<div class="h-captcha" data-sitekey="your_site_key"></div>
后端代码：
<?php$data = array('secret' => "my-secret (should start with 0x..)",'response' => $_POST['h-captcha-response']);$verify = curl_init();curl_setopt($verify, CURLOPT_URL, "https://hcaptcha.com/siteverify");curl_setopt($verify, CURLOPT_POST, true);curl_setopt($verify, CURLOPT_POSTFIELDS, http_build_query($data));curl_setopt($verify, CURLOPT_RETURNTRANSFER, true);$response = curl_exec($verify);// var_dump($response);$responseData = json_decode($response);if($responseData->success) {// your success code goes here} else {// return error to user; they did not pass}？>
完整的PHP接收表单验证码例子：
<?phpif(isset($_POST['submit'])):if(isset($_POST['h-captcha-response']) && !empty($_POST['h-captcha-response'])):// get verify response$data = array('secret' => "你的服务密匙",'response' => $_POST['h-captcha-response']);$verify = curl_init();curl_setopt($verify, CURLOPT_URL, "https://hcaptcha.com/siteverify");curl_setopt($verify, CURLOPT_POST, true);curl_setopt($verify, CURLOPT_POSTFIELDS, http_build_query($data));curl_setopt($verify, CURLOPT_RETURNTRANSFER, true);$verifyResponse = curl_exec($verify); $responseData = json_decode($verifyResponse); $name = !empty($_POST['name'])?$_POST['name']:'';$email = !empty($_POST['email'])?$_POST['email']:'';$message = !empty($_POST['message'])?$_POST['message']:'';if($responseData->success)://contact form submission code$to = 'your@email.com';$subject = 'New contact form has been submitted';$htmlContent = "<h1>Contact request details</h1><p><b>Name: </b>".$name."</p><p><b>Email: </b>".$email."</p><p><b>Message: </b>".$message."</p>";// Always set content-type when sending HTML email$headers = "MIME-Version: 1.0" . "\r\n";$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";// More headers$headers .= 'From:'.$name.' <'.$email.'>' . "\r\n";//send email@mail($to,$subject,$htmlContent,$headers);$succMsg = 'Your contact request has been submitted successfully.';$name = '';$email = '';$message = '';else:$errMsg = 'hCaptcha verification failed. Please try again.';endif;else:$errMsg = 'Please click on the hCaptcha button.';endif;else:$errMsg = '';$succMsg = '';$name = '';$email = '';$message = '';endif;?><html><head><title>Using hCaptcha with PHP</title><script src="https://www.hCaptcha.com/1/api.js" async defer></script></head><body><div><h2>Contact Form</h2><?php if(!empty($errMsg)): ?><div class="errMsg"><?php echo $errMsg; ?></div><?php endif; ?><?php if(!empty($succMsg)): ?><div class="succMsg"><?php echo $succMsg; ?></div><?php endif; ?><div><form action="" method="POST"><input type="text" class="text" value="<?php echo !empty($name)?$name:''; ?>" placeholder="Your full name" name="name" ><input type="text" class="text" value="<?php echo !empty($email)?$email:''; ?>" placeholder="Email adress" name="email" ><textarea type="text" placeholder="Message..." required="" name="message"><?php echo !empty($message)?$message:''; ?></textarea><div class="h-captcha" data-sitekey="网站Key"></div><input type="submit" name="submit" value="SUBMIT"></form></div> <div class="clear"> </div></div></body></html>
hcaptcha使用常见问题
问：怎样知道代码运行正常？
答：可在面板看到 served 和 solved 数量，如果solved 有显示数字，说明hCaptcha运行正常。
问：如何防止用户没有完成验证，直接点了提交按钮？
#(去掉#) $("form").submit(function(event) {var hcaptchaVal = $('[name=h-captcha-response]').value;if (hcaptchaVal === "") {event.preventDefault();alert("Please complete the hCaptcha");}});
问：hCaptcha plugin for WordPress 有hCaptcha WP插件吗？
答：如果嫌麻烦，不想用代码，而且用wordpress博客程序, 那么直接用WP 插件即可，可以在WP插件搜索中找到。
原文链接：https://jiemahao.com/hcaptcha-stop-bots/，转载请注明出处。
