How to Manually Parse Raw Multipart/Form-Data Data in PHP?

Manually Parsing Raw Multipart/Form-Data Data in PHP

When processing data from HTTP PUT requests with multipart/form-data format, PHP does not automatically parse the raw data. Consequently, developers may encounter challenges in extracting information from such requests.

Solution:

1. Read the Raw Request Data:

   • Use file_get_contents('php://input') to read the raw data.

2. Extract Boundary from Content Type Header:

   • Use a regular expression to capture the boundary value from the Content-Type header ($_SERVER['CONTENT_TYPE']).

3. Split Data by Boundary:

   • Split the raw data into individual blocks using preg_split("- $boundary").

4. Separate Blocks into Individual Fields:

   • For each block:

     • Uploaded Files:

       • Look for blocks containing application/octet-stream and extract the field name and filename.

     • Other Fields:

       • Extract the field name and value using a regular expression.

示例 Code:

<code class="php">function parse_raw_http_request(array &$a_data)
{
  $input = file_get_contents('php://input');
  preg_match('/boundary=(.*)$/', $_SERVER['CONTENT_TYPE'], $matches);
  $boundary = $matches[1];

  $a_blocks = preg_split("/-+$boundary/", $input);
  array_pop($a_blocks);

  foreach ($a_blocks as $id => $block)
  {
    if (empty($block))
      continue;

    if (strpos($block, 'application/octet-stream') !== FALSE)
    {
      preg_match('/name=\&quot;([^\&quot;]*)\&quot;.*stream[\n|\r]+([^\n\r].*)?$/s', $block, $matches);
    }
    else
    {
      preg_match('/name=\&quot;([^\&quot;]*)\&quot;[\n|\r]+([^\n\r].*)?\r$/s', $block, $matches);
    }
    $a_data[$matches[1]] = $matches[2];
  }
}</code>

Usage:

<code class="php">$a_data = array();
parse_raw_http_request($a_data);
var_dump($a_data);</code>

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