在 PHP 中使用 cURL 发布文件字符串？

POST a file string using cURL in PHP?

提问by gawpertron

I was wondering if it is possible to post a file - along with other form data - when the file is just a string?

我想知道是否可以发布文件 - 以及其他表单数据 - 当文件只是一个字符串时？

I know that you can post a file that is already on the filesystem by prefixing the filepath with "@".

我知道您可以通过在文件路径前加上“@”来发布文件系统上已有的文件。

However I'd like to bypass creating a temporary file and send just the file as a string, but I am unsure how to construct the request using cURL in PHP.

但是，我想绕过创建临时文件并仅将文件作为字符串发送，但我不确定如何在 PHP 中使用 cURL 构造请求。

Cheers

干杯

    $postFields = array(
        'otherFields'   => 'Yes'
        ,'filename'     => 'my_file.csv'
        ,'data'         => 'comma seperated content'
    );

    $options = array(
        CURLOPT_RETURNTRANSFER  => true
        ,CURLOPT_SSL_VERIFYPEER => false
        ,CURLOPT_SSL_VERIFYHOST => 1
        ,CURLOPT_POSTFIELDS     => $postFields
        ,CURLOPT_HTTPHEADER     => array(
            'Content-type: multipart/form-data'
        )
    );

采纳答案by Piskvor left the building

Should be possible: here's a form, posted through a browser (irrelevant fields omitted):

应该是可能的：这是一个通过浏览器发布的表单（省略了不相关的字段）：

POST http://host.example.com/somewhere HTTP/1.1
Content-Type: multipart/form-data; boundary=---------------------------7da16b2e4026c
Content-Length: 105732

-----------------------------7da16b2e4026c
Content-Disposition: form-data; name="NewFile"; filename="test.jpg"
Content-Type: image/jpeg

(...raw JPEG data here...)
-----------------------------7da16b2e4026c
Content-Disposition: form-data; name="otherformfield"

content of otherformfield is this text
-----------------------------7da16b2e4026c--

So, if we build the POST body ourselves and set an extra header or two, we should be able to simulate this:

因此，如果我们自己构建 POST 主体并设置一两个额外的标头，我们应该能够模拟这一点：

// form field separator
$delimiter = '-------------' . uniqid();
// file upload fields: name => array(type=>'mime/type',content=>'raw data')
$fileFields = array(
    'file1' => array(
        'type' => 'text/plain',
        'content' => '...your raw file content goes here...'
    ), /* ... */
);
// all other fields (not file upload): name => value
$postFields = array(
    'otherformfield'   => 'content of otherformfield is this text',
    /* ... */
);

$data = '';

// populate normal fields first (simpler)
foreach ($postFields as $name => $content) {
   $data .= "--" . $delimiter . "\r\n";
    $data .= 'Content-Disposition: form-data; name="' . $name . '"';
    // note: double endline
    $data .= "\r\n\r\n";
}
// populate file fields
foreach ($fileFields as $name => $file) {
    $data .= "--" . $delimiter . "\r\n";
    // "filename" attribute is not essential; server-side scripts may use it
    $data .= 'Content-Disposition: form-data; name="' . $name . '";' .
             ' filename="' . $name . '"' . "\r\n";
    // this is, again, informative only; good practice to include though
    $data .= 'Content-Type: ' . $file['type'] . "\r\n";
    // this endline must be here to indicate end of headers
    $data .= "\r\n";
    // the file itself (note: there's no encoding of any kind)
    $data .= $file['content'] . "\r\n";
}
// last delimiter
$data .= "--" . $delimiter . "--\r\n";

$handle = curl_init($url);
curl_setopt($handle, CURLOPT_POST, true);
curl_setopt($handle, CURLOPT_HTTPHEADER , array(
    'Content-Type: multipart/form-data; boundary=' . $delimiter,
    'Content-Length: ' . strlen($data)));  
curl_setopt($handle, CURLOPT_POSTFIELDS, $data);
curl_exec($handle);

This way, we're doing all the heavy lifting ourselves, and trusting cURL not to mangle it.

这样，我们自己做所有繁重的工作，并且相信 cURL 不会破坏它。

回答by erik.wiffin

php has access to a temporary location "php://memory", which actually makes what you're trying to do fairly easy.

php 可以访问一个临时位置“php://memory”，这实际上使您尝试做的事情变得相当容易。

$fh = fopen('php://memory','rw');
fwrite( $fh, $content);
rewind($fh);

$options = array(
    CURLOPT_RETURNTRANSFER  => true
    ,CURLOPT_SSL_VERIFYPEER => false
    ,CURLOPT_SSL_VERIFYHOST => 1
    ,CURLOPT_HTTPHEADER     => array(
        'Content-type: multipart/form-data'
    )
    ,CURLOPT_INFILE         => $fh
    ,CURLOPT_INFILESIZE     => strlen($content)
);