How to Manually Parse Raw Multipart/Form-Data Data with PHP for PUT Requests?

Manually Parsing Raw Multipart/Form-Data Data with PHP

Parsing raw HTTP request data formatted in multipart/form-data can be challenging when dealing with PUT requests in PHP. The following provides a detailed explanation and a custom parsing solution:

Background

By default, PHP automatically parses POST request data if formatted correctly. However, PUT requests require manual parsing of raw data. Multipart/form-data format structures the data into blocks separated by boundaries.

Manual Parsing Function

The following function parses raw HTTP request data manually:

<code class="php">function parse_raw_http_request(array &$a_data)
{
  // Read incoming data
  $input = file_get_contents('php://input');

  // Extract boundary from content type header
  preg_match('/boundary=(.*)$/', $_SERVER['CONTENT_TYPE'], $matches);
  $boundary = $matches[1];

  // Split data by boundary
  $a_blocks = preg_split("/-$boundary/", $input);
  array_pop($a_blocks);

  // Loop through data blocks
  foreach ($a_blocks as $id => $block)
  {
    // Skip empty blocks
    if (empty($block))
      continue;

    // Parse uploaded files
    if (strpos($block, 'application/octet-stream') !== FALSE)
    {
      // Extract name and file contents
      preg_match('/name=\&quot;([^\&quot;]*)\&quot;.*stream[\n|\r]+([^\n\r].*)?$/s', $block, $matches);
    }
    // Parse other fields
    else
    {
      // Extract name and value
      preg_match('/name=\&quot;([^\&quot;]*)\&quot;[\n|\r]+([^\n\r].*)?\r$/s', $block, $matches);
    }

    // Add data to array
    $a_data[$matches[1]] = $matches[2];
  }  
}</code>

Usage:

Call the function and pass the data array by reference:

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

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