使用cURL在PHP中发布文件字符串？

Question

我想知道是否有可能在文件只是字符串的情况下发布文件以及其他表单数据？

我知道您可以通过在文件路径前面加上“ @”前缀来发布文件系统中已经存在的文件。

但是，我想绕过创建一个临时文件，而仅将该文件作为字符串发送，但是我不确定如何在PHP中使用cURL构造请求。

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'
        )
    );

Answer 1

应该可以：这是通过浏览器发布的表格（忽略了不相关的字段）：

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--

因此，如果我们自己构建POST主体并设置一个或多个额外的标头，则我们应该能够模拟此：

// 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);

这样，我们正在做所有繁重的工作，并相信cURL不会破坏它。