function wmzz_recaptcha_check()
{
    $s = option::pget('wmzz_recaptcha');
    $resp = recaptcha_check_answer($s['sk'], $_SERVER["REMOTE_ADDR"], $_POST["recaptcha_challenge_field"], $_POST["recaptcha_response_field"]);
    if (!$resp->is_valid) {
        msg('注册失败,您输入的验证码有误');
    }
}
<?php

if (!defined('SYSTEM_ROOT')) {
    die('Insufficient Permissions');
}
$s = option::pget('fyy_massistant');
if (empty($s['key']) && !isset($_GET['begin'])) {
    ?>
			<div class="jumbotron">
				<h1>Hello, master!</h1>
				<h2>你的云签助手(总站)已经安装完毕</h2>
				<br/>
				<p>由于本插件较为复杂,需要您先阅读一下<a href="http://www.stus8.com/forum.php?mod=viewthread&tid=6531" target="_blank">注意事项</a>(第二页)</p>
				<p>仔细的阅读之后,相信您对这款插件…</p>
				<p>还是不怎么了解</p>
				<br/>
				<p>还请您在使用中慢慢探索……</p>
				<p><a class="btn btn-primary btn-lg" href="index.php?mod=admin:setplug&plug=fyy_massistant&begin" role="button">开始设置</a></p>
			</div>
		<?php 
    die;
}
?>

<ul class="nav nav-tabs" role="tablist">
	<li<?php 
if (isset($_REQUEST['plug']) && $_REQUEST['plug'] == "fyy_massistant" && $_REQUEST['p'] == '') {
    echo ' class="active"';
}
?>
><a href="index.php?mod=admin:setplug&plug=fyy_massistant">设置</a></li>
<?php

if (!defined('SYSTEM_ROOT')) {
    die('Insufficient Permissions');
}
$s = option::pget('wmzz_recaptcha');
?>
<h2>reCAPTCHA 注册验证码</h2><br/>
<form action="setting.php?mod=plugin:wmzz_recaptcha" method="post">
	<div class="input-group">
	  <span class="input-group-addon">Public Key [ 公钥 ]</span>
	  <input type="text" class="form-control" name="ak" required="" value="<?php 
echo $s['ak'];
?>
">
	</div><br>
	<div class="input-group">
	  <span class="input-group-addon">Private Key [ 私钥 ]</span>
	  <input type="text" class="form-control" name="sk" required="" value="<?php 
echo $s['sk'];
?>
">
	</div><br>
	<button type="submit" class="btn btn-success" >保存设置</button>
</form>

<br/>
请在 reCAPTCHA API 管理页面,选择添加的域名,复制 Public Key 和 Private Key 到上面的表单中即可
<br/><br/>
<b>相关链接:</b><a href="https://www.google.com/recaptcha/admin#list" target="_blank">管理 reCAPTCHA API</a> | 
<a href="https://www.google.com/recaptcha/admin#createsite" target="_blank">添加 reCAPTCHA API</a>