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

Accessing Raw Multipart/Form-Data POST Data

In PHP, the default behavior for multipart/form-data POST requests is for the input data to be parsed automatically by PHP. This poses a problem if you need access to the raw, unparsed data.

While both php://input and $HTTP_RAW_POST_DATA can be used to access raw POST data, neither work for multipart/form-data requests.

Workaround

Unfortunately, obtaining the raw data for multipart/form-data forms is not possible through conventional PHP methods. PHP insists on parsing the data itself, making it unavailable for manual parsing.

However, there is a workaround that involves modifying the Apache configuration. By adding the following snippet to your apache conf file, you can change the Content-Type of incoming requests:

<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> 

This will force PHP to treat the multipart/form-data request as multipart/form-data-alternate, preventing automatic parsing. With this workaround, you can access the raw data by reading from php://input and parsing it manually.

Limitations

While this workaround allows you to access the raw data, it also has limitations. Specifically, the $_FILES superglobal will be empty, since PHP will not be parsing the form data.

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