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

Manually Parsing Raw Multipart/Form-Data Data in PHP

Problem Overview

Parsing raw HTTP request data in multipart/form-data format can be challenging in PHP, especially when receiving data via a PUT request that's not automatically parsed.

Solution with Manual Parsing

As PHP does not automatically handle PUT requests with multipart/form-data, manual parsing is necessary. Here's how it can be achieved:

1. Read Raw Data: Use file_get_contents('php://input') to read the raw request data.
2. Extract Boundary: Parse the CONTENT_TYPE header to obtain the boundary string that separates multipart data segments.
3. Split Content: Divide the raw data into blocks based on the boundary string. Remove the trailing "--" element.

4. Parse Blocks: Iterate through each block to identify and parse the data fields:

   • Uploaded Files: Match blocks that indicate file uploads using the application/octet-stream MIME type. Extract the name attribute and the binary file content.
   • Non-File Fields: Match blocks containing form data fields. Extract the name attribute and the corresponding value.

Usage

1. Pass an empty array by reference as an argument to the parse_raw_http_request function.
2. Call the function to populate the array with parsed data.
3. Access the parsed data using the array keys corresponding to form field names.

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