使用cURL从php验证谷歌的reCaptcha代码

<form method="POST" action="verify.php">
  <!-- 其他表单字段 -->
  
  <div class="g-recaptcha" data-sitekey="YOUR_SITE_KEY"></div>
  
  <button type="submit">提交</button>
</form>

<?php
// 获取reCaptcha响应
$recaptchaResponse = $_POST['g-recaptcha-response'];

// 验证reCaptcha响应
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://www.google.com/recaptcha/api/siteverify');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
    'secret' => 'YOUR_SECRET_KEY',
    'response' => $recaptchaResponse
]));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

// 解析reCaptcha验证结果
$result = json_decode($response, true);
if ($result['success']) {
    // reCaptcha验证通过，执行其他操作
    // ...
    echo 'reCaptcha验证通过';
} else {
    // reCaptcha验证失败
    // ...
    echo 'reCaptcha验证失败';
}
?>