PHP - 使用 CURL 将图像文件上传到其他域 [英] PHP - Upload an image file to other domain with CURL

问题描述

我有两个域，例如 site1.loc 和 site2.loc.在 site1.loc 中，我有一个像这样的 php 表单文件:

I have two domain, as example site1.loc and site2.loc. In site1.loc i have a php form file like this:

<?php
$c_name = "";
$c_phone = "";

if($_SERVER['REQUEST_METHOD']=="POST"){

    $c_name = $_POST['c_name'];
    $c_phone = $_POST['c_phone'];
    $c_pic = $_FILES['c_pic']['name']; // Image file

        // submit target URL
        $url = 'http://site2.loc/handler.php';

        $fields = array(
           'field1'=>$c_name,
           'field2'=>$c_phone,
           'field3'=>$c_pic
        );

        $postvars='';
        $sep='';
        foreach($fields as $key=>$value) 
        { 
           $postvars.= $sep.urlencode($key).'='.urlencode($value); 
           $sep='&'; 
        }


        //open connection
        $ch = curl_init();

        //set the url, number of POST vars, POST data
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_POST,count($fields));
        curl_setopt($ch,CURLOPT_POSTFIELDS,$postvars);

        //execute post
        $result = curl_exec($ch);

        if(curl_errno($ch)) {
            echo 'Error: ' . curl_error($ch);
        }
        else {
            echo $result;
        }

        //close connection
        curl_close($ch);

}


echo '
<form action="" method="post" enctype="multipart/form-data">
    Name : <input type="text" name="c_name" value="'.$c_name.'" /> <br />
    Phone : <input type="text" name="c_phone" value="'.$c_phone.'" /> <br />
    Image : <input type="file" name="c_pic" /> <br />
    <input type="submit" />
</form>
    ';
?>

和 handler.php 在 site2.loc 中，如下所示:

and handler.php in site2.loc like this:

<?php
ob_start();
if (!isset($_SESSION)) { session_start(); }

    // CONNECT TO DB
    $db_con = mysql_connect("localhost", "root", "root");// or die("Could not connect to db.");
    if(!mysql_select_db("site2",$db_con)) die("No database selected.");

    // POST
    if(isset($_POST)){
        $c_name = $_POST['field1'];
        $c_phone = $_POST['field2'];    
        $c_pic = $_POST['field3'];  

        // UPLOAD FILE
        /* UPLOAD IMAGE CODE HERE */

        // INSERT TO DB
        if(mysql_query("INSERT INTO kontak (nama, telpon) VALUES ('$c_name','$c_phone')")){
            echo "INSERT SUCCESS";
        } else {
            echo "INSERT FAILED";
        }
    }

?>

此脚本运行良好，用于将数据存储到数据库，但不能用于上传图像文件.有人可以帮我修改上面的脚本以上传图像文件吗?

This script runs well for storing the data to the database, but can not for upload an image file. Can anybody help me modify scripts above in order to upload an image file?

之前谢谢.

推荐答案

此答案中没有代码，只是一个绕过 curl 的工作流程示例:

No code in this answer, just a work flow example that will bypass curl:

1. 用户按照正常方式将包含上传文件的表单发布到站点 1".
2. 站点 1"处理表单和上传的文件.该文件位于可通过网络访问的临时目录中.
3. 在站点 1"上，检查上传的文件后，创建 file_get_contents('http://site2.loc/pullfile.php?f=filename&sec=checkcode')称呼.pullfile.php 的内容就是这样做的，将文件从站点 1"拉到站点 2".
4. 可以检查 file_get_contents() 返回的站点 2"pullfile.php 是否有错误返回，并在出错时进行处理.没有错误，删除临时文件.
5. &sec=checkcode 可用于确认文件已成功上传到站点 2".它可能是文件的 MD5 或您想出的其他内容.

1. User posts a form with the uploaded file to "site 1", as per normal.
2. "site 1" processes the form and the uploaded file. The file is placed in a temp directory which is web accessible.
3. On "site 1", once the uploaded file has been checked, make a file_get_contents('http://site2.loc/pullfile.php?f=filename&sec=checkcode') call. The contents of pullfile.php will do just that, pull the file from "site 1" to "site 2".
4. The return from file_get_contents() can be checked for an error return from the "site 2" pullfile.php and on error, deal with it. No error, remove the temp file.
5. The &sec=checkcode could be used to confirm the file has been uploaded successfully to "site 2". It could be an MD5 of the file or something else you come up with.

只是一个想法.

编辑:一些示例代码有助于使事情更清晰，也许:]

Edit: Some sample code to help make things clearer, maybe :]

// ---- Site 1, formprocess.php ----

// Your form processing goes here, including
// saving the uploaded file to a temp dir.

// Once the uploaded file is checked for errors, 
// you need move it to a known temp folder called 
// 'tmp'.

// this is the uploaded file name (which you would
// have got from the processed form data in $_FILES
// For this sample code, it is simple hard-coded.
$site1File = 'test.jpg';

$site1FileMd5 = md5_file('./tmp/'.$site1File);

// now make a remote request to "site 2"
$site2Result = file_get_contents('http://'.SITE_2_URL.'/pullfile.php?f='.$site1File.'&md5='.$site1FileMd5);

if ($site2Result == 'done') {
    unlink('./tmp/'.$site1File);
} else {
    echo '<p>
         Uploaded file failed to transfer to '.SITE_2_URL.'
          - but will be dealt with later.
         </p>';
}

这将是站点 2 上的pullfile.php"

And this will be the 'pullfile.php' on site 2

// ----- Site 2, pullfile.php -----

// This script will pull a file from site 1 and
// place it in '/uploaded'

// used to cross-check the uploaded file
$fileMd5 = $_GET['md5'];
$fileName = basename($_GET['f']);

// we need to pull the file from the './tmp/' dir on site 1
$pulledFile = file_get_contents('http://'.SITE_1_URL.'/tmp/'.$fileName);

// save that file to disk
$result = file_put_contents('./uploaded/'.$fileName,$pulledFile);
if (! $result) {
    echo 'Error: problem writing file to disk';
    exit;
}

$pulledMd5 = md5_file('./uploaded/'.$fileName);
if ($pulledMd5 != $fileMd5) {
    echo 'Error: md5 mis-match';
    exit;
}

// At this point, everything should be right.
// We pass back 'done' to site 1, so we know 
// everything went smooth. This way, a 'blank'
// return can be treated as an error too.
echo 'done';
exit;

这篇关于PHP - 使用 CURL 将图像文件上传到其他域的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！