当var_dump（$ _ POST）显示数组时，为什么会出现未定义的索引错误？

Question

我有一个表单，将数据发布到同一本地站点上的PHP页面。我知道数据是正确发布的，因为var_dump($_POST)会输出一个包含预期信息的数组，如下所示。

但是，当我尝试将变量设置为数组中的某个值时，我在日志中收到一条错误通知，说我有一个未定义的索引（对于email和g-captcha响应字段）并且PHP代码没有按预期工作。

我一直在试着弄清楚为什么会发生这种情况已经有一段时间了，而其他类似的问题并没有透露答案。任何帮助，将不胜感激。谢谢！

表格代码：

<form action="recaptcha.php" method="post" class="pardot-email-form-handler" id="carter" novalidate>
    <input class="one-field-pardot-form-handler" maxlength="80" name="email" id="email" size="20" type="email" placeholder="Enter Email Address" required="required" />
    <div style="position:absolute; left:-9999px; top: -9999px;">
        <label for="pardot_extra_field">
            Comments
        </label>
        <input type="text" id="pardot_extra_field" name="pardot_extra_field">
    </div>
    <button class="g-recaptcha" data-sitekey="6LeErDUUAAAAAEOYqDrylFnEwQkYp7qmPjs2_Z0o" data-callback="captchaSubmit" data-badge="inline">
        Submit
    </button>
</form>

PHP代码：

var_dump($_POST);
// reCaptcha info
$secret = "anonymous";
$remoteip = $_SERVER["REMOTE_ADDR"];
$url = "https://www.google.com/recaptcha/api/siteverify";

// Form info
$email = $_POST["email"];
$response = $_POST["g-recaptcha-response"];

// Curl Request
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, array(
    'secret' => $secret,
    'response' => $response,
    'remoteip' => $remoteip
    ));
$curlData = curl_exec($curl);
curl_close($curl);

// Parse data
$recaptcha = json_decode($curlData, true);
if ($recaptcha["success"])
    echo "Success!";
else
    echo "Failure!";

Var_Dump结果：

  array (size=3)
  'email' => string 'an email address' (length=21)
  'pardot_extra_field' => string 'a comment' (length=12)
  'g-recaptcha-response' => string 'a long response' (length=441)

PHP错误消息：

[01-Jan-2018 15:42:02 UTC] PHP注意：未定义的索引：首先在第17行的C：\ wamp \ www \ local \ public \ recaptcha.php中

[01-Jan-2018 15:42:02 UTC] PHP Stack trace：

[01-Jan-2018 15:42:02 UTC] PHP 1. {main}（）C：\ wamp \ www \ local \ public \ recaptcha.php：0

[01-Jan-2018 15:42:02 UTC] PHP注意：未定义的索引：最后在第18行的C：\ wamp \ www \ local \ public \ recaptcha.php

[01-Jan-2018 15:42:02 UTC] PHP Stack trace：

[01-Jan-2018 15:42:02 UTC] PHP 1. {main}（）C：\ wamp \ www \ local \ public \ recaptcha.php：0

Answer 1

从您添加的错误消息中，代码正在数组中查找索引first / last，但无法找到它。

但是在您的代码中似乎没有任何此类关键名称的引用。

在代码中似乎没有索引的第一个或最后一个数组。

并且没有名为first或last的表单输入标签。

检查您是否引用了正确的文件。

Answer 2

这里（windows 10，xampp，PHP版本7.1.8）用“小”修改我得到你的秘密代码是错误的（无效输入秘密请参阅google recaptcha returns false due to "invalid-input-secret"）但你如何在验证captcha https://developers.google.com/recaptcha/docs/display后看到结果存在

结果：array（3）{[“email”] => string（16）“[email protected]”[“pardot_extra_field”] => string（0）“”[“g-recaptcha-response”] => string （334） “03 AMPJSYXAiSFTZyU0mzcYHYpzpKF8EODvfGkWJHQjc8fgNVNFgv3lm7ZSZVwSpwXtvHRS3JnNwAtsnfsdwpQMXz10zw7xSmhx8Jd7IkZ6J86Boh70WXXBjrczIGMcndbHZSW3boZucbO8sneKrcuZDsIqrGsmi00ECwDZ3ntvpq5qATQeDN5nhuSOesdgdG7V_XMjKINHPUZPh0ZA6fPsMXvD4GNeGqOvaB1OJidQvaxcdK7vIr-aOqr5tOJNbwxSRR941caXJT5ggkWnA4O2bzQrphcIdQ3USyO0OcKPNBqN1IWGE18XGE0ioesL3YScvoMKFzWkeF-F”} 03 AMPJSYXAiSFTZyU0mzcYHYpzpKF8EODvfGkWJHQjc8fgNVNFgv3lm7ZSZVwSpwXtvHRS3JnNwAtsnfsdwpQMXz10zw7xSmhx8Jd7IkZ6J86Boh70WXXBjrczIGMcndbHZSW3boZucbO8sneKrcuZDsIqrGsmi00ECwDZ3ntvpq5qATQeDN5nhuSOesdgdG7V_XMjKINHPUZPh0ZA6fPsMXvD4GNeGqOvaB1OJidQvaxcdK7vIr-aOqr5tOJNbwxSRR941caXJT5ggkWnA4O2bzQrphcIdQ3USyO0OcKPNBqN1IWGE18XGE0ioesL3YScvoMKFzWkeF-F { “成功”：假的， “错误代码”： “无效的输入机密”]}失败！

<?php
var_dump($_POST);
    // reCaptcha info
    $secret = "anonymous";
    $remoteip = $_SERVER["REMOTE_ADDR"];
    $url = "https://www.google.com/recaptcha/api/siteverify";


if(isset($_POST["email"])){

    // Form info
    $email = $_POST["email"];
    $response = $_POST["g-recaptcha-response"];

    // Curl Request
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_POST, true);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, array(
        'secret' => '6LeErDUUAAAAAEOYqDrylFnEwQkYp7qmPjs2_Z0o',//$secret,
        'response' => $response,
        'remoteip' => $remoteip
        ));
    $curlData = curl_exec($curl);
    curl_close($curl);
print_r($response);
print_r($curlData);
    // Parse data
    $recaptcha = json_decode($curlData, true);
    if ($recaptcha["success"])
        echo "Success!";
    else
        echo "Failure!";
}
?>
<script src="https://www.google.com/recaptcha/api.js" async defer></script>

<!-- recaptcha.php --><form action="" method="post" class="pardot-email-form-handler" id="carter" novalidate>
    <input class="one-field-pardot-form-handler" maxlength="80" name="email" id="email" size="20" type="email" placeholder="Enter Email Address" required="required" />
    <div style="position:absolute; left:-9999px; top: -9999px;">
        <label for="pardot_extra_field">
            Comments
        </label>
        <input type="text" id="pardot_extra_field" name="pardot_extra_field">
    </div>
    <!-- <button class="g-recaptcha" data-sitekey="6LeErDUUAAAAAEOYqDrylFnEwQkYp7qmPjs2_Z0o" data-callback="captchaSubmit" data-badge="inline">
        Submit
    </button> -->
    <input type="submit" value="Submit">

     <div class="g-recaptcha" data-sitekey="6LeErDUUAAAAAEOYqDrylFnEwQkYp7qmPjs2_Z0o"></div>

</form><hr><?php phpinfo(); ?>