PHP调用file_get_contents出现HTTP request failed报错如何解决

• 逻辑死循环：原有逻辑中访问MyMessagesMDB.php会触发调用GetMessages.php，而GetMessages.php执行取数逻辑后又会主动POST请求回MyMessagesMDB.php，两个脚本互相调用导致请求超时，这是报错的核心原因。
• 配置问题：php.ini中allow_url_fopen配置项未开启，会导致file_get_contents无法发起跨域HTTP请求。
• 网络限制：服务器自身可能无法访问192.168.0.102的内网地址，比如防火墙拦截、端口未开放、路由不通等。
• 逻辑冗余：两个脚本都在同一台服务器的场景下，完全不需要走HTTP请求传递数据，本地引入效率更高。

提供两种可落地的修复方案，优先推荐第二种本地引入的方案，性能更高、稳定性更强。

方案1：修复原有HTTP调用逻辑 #

先修改GetMessages.php，去掉主动POST回MyMessagesMDB.php的逻辑，直接返回JSON格式的查询结果：

<?php
$FirstName = '';
$LastName = '';
$Email = '';
$Subject = '';
$Message = '';

GetFromDB();
// 直接输出JSON数据供调用方获取
echo json_encode([
    'FirstName' => $FirstName,
    'LastName' => $LastName,
    'Email' => $Email,
    'Subject' => $Subject,
    'TextMessage' => $Message
]);

function GetFromDB(){
    $client = new MongoDB\Driver\Manager('mongodb+srv://####:####@####.tldyu.mongodb.net/Data');
    $filter = [];
    $options = [];
    $query = new MongoDB\Driver\Query($filter, $options);
    $cursor = $client->executeQuery('ContactMessages.ContactForm', $query);

    foreach($cursor as $document){
        $document = json_decode(json_encode($document),true);

        global $FirstName, $LastName, $Email, $Subject, $Message;
        $FirstName = $document['FirstName'];
        $LastName = $document['LastName'];
        $Email = $document['Email'];
        $Subject = $document['Subject'];
        $Message = $document['Message'];
    }
}
?>

再修改MyMessagesMDB.php，用兼容性更强的cURL调用GetMessages.php，直接解析返回的JSON结果即可：

<?php
// 用cURL调用GetMessages.php，替代file_get_contents
$curl_handle = curl_init();
curl_setopt($curl_handle, CURLOPT_URL, 'http://192.168.0.102/test/GetMessages.php');
curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl_handle, CURLOPT_USERAGENT, 'PHP Local Script');
// 如果是HTTPS地址可添加以下两行跳过证书校验
curl_setopt($curl_handle, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl_handle, CURLOPT_SSL_VERIFYHOST, false);
$response = curl_exec($curl_handle);

// 排查错误时可开启以下代码打印cURL错误
// if(curl_errno($curl_handle)){
//     echo 'cURL错误信息：' . curl_error($curl_handle);
// }
curl_close($curl_handle);

$data = json_decode($response, true) ?? [];
$FirstName = $data["FirstName"] ?? "";
$LastName = $data["LastName"] ?? "";
$Email = $data["Email"] ?? "";
$Subject = $data["Subject"] ?? "";
$Message = $data["TextMessage"] ?? "";

echo $FirstName." ".$LastName;
echo "<br>";
echo $Email;
echo "<br>";
echo $Subject;
echo "<br>";
echo $Message;
echo "<br>";
?>

方案2：本地文件引入（推荐） #

两个脚本在同一台服务器的场景下，直接引入文件调用方法即可，完全避免网络请求的各类问题：
首先修改GetMessages.php，封装成可直接返回数据的函数，去掉多余的输出和HTTP请求逻辑：

<?php
function GetMessageFromDB(){
    $client = new MongoDB\Driver\Manager('mongodb+srv://####:####@####.tldyu.mongodb.net/Data');
    $filter = [];
    $options = [];
    $query = new MongoDB\Driver\Query($filter, $options);
    $cursor = $client->executeQuery('ContactMessages.ContactForm', $query);
    $result = [];
    foreach($cursor as $document){
        $document = json_decode(json_encode($document),true);
        $result = [
            'FirstName' => $document['FirstName'],
            'LastName' => $document['LastName'],
            'Email' => $document['Email'],
            'Subject' => $document['Subject'],
            'TextMessage' => $document['Message']
        ];
        // 如果只需要取最新一条数据可打开下方break，避免遍历后变量被覆盖
        // break;
    }
    return $result;
}
?>

再修改MyMessagesMDB.php，直接引入文件调用函数拿数据：

<?php
// 注意替换为你服务器上GetMessages.php的实际路径
include_once './GetMessages.php';
$data = GetMessageFromDB();

$FirstName = $data["FirstName"] ?? "";
$LastName = $data["LastName"] ?? "";
$Email = $data["Email"] ?? "";
$Subject = $data["Subject"] ?? "";
$Message = $data["TextMessage"] ?? "";

echo $FirstName." ".$LastName;
echo "<br>";
echo $Email;
echo "<br>";
echo $Subject;
echo "<br>";
echo $Message;
echo "<br>";
?>

如果坚持使用HTTP调用的方式，可先确认以下配置是否正常：

1. 检查php.ini配置中allow_url_fopen = On，修改后需重启web服务生效
2. 登录服务器执行curl http://192.168.0.102/test/GetMessages.php测试网络连通性
3. 检查服务器防火墙、安全组是否放行内网80端口的访问请求

内容的提问来源于stack exchange，提问作者Mike Aelbrecht