How Can I Access Raw POST Data from Multipart/Form-Data Requests in PHP?

Accessing Raw Post Data for Multipart/Form-Data Requests

While PHP offers mechanisms like php://input and $HTTP_RAW_POST_DATA for retrieving raw POST data, these methods are ineffective for multipart/form-data requests. According to the PHP manual:

"[...] php://input is not available with enctype="multipart/form-data"."

Solution for Multipart/Form-Data Forms

Accessing raw data for such forms requires a workaround. You cannot directly retrieve it because PHP automatically parses it. However, you can employ the following hack:

1. Modify your Apache configuration:

<Location "/backend/XXX.php">
    SetEnvIf Content-Type ^(multipart/form-data)(.*) NEW_CONTENT_TYPE=multipart/form-data-alternate OLD_CONTENT_TYPE=
    RequestHeader set Content-Type %{NEW_CONTENT_TYPE}e env=NEW_CONTENT_TYPE
</Location>

2. This will change the Content-Type of requests sent to XXX.php from multipart/form-data to multipart/form-data-alternate. This will prevent PHP from automatically parsing the data.
3. Read the raw data from php://input. You can now retrieve the raw data and parse it yourself.

Caution:

While this workaround solves the raw data retrieval problem, it will result in an empty $_FILES array.

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