How to Post Raw Image Data as Multipart/Form-Data Using PHP\'s Curl?

Posting Raw Image Data as Multipart/Form-Data in Curl

When working with APIs that require image data to be transmitted as a multipart/form-data, challenges can arise. In this case, a user encounters difficulties in posting an image using PHP's curl extension with multipart/form-data headers.

The issue lies in setting the CURLOPT_POSTFIELDS option correctly. In PHP versions prior to 5.6, it was possible to use @$filePath to specify the path to the raw image data. However, this approach is no longer supported, and in PHP 7, it is completely removed.

The solution involves using a CurlFile object to encapsulate the file information, including the path, MIME type, and filename. The CurlFile object should then be added to an array ($fields in the example code) that represents the multipart/form-data. This array is then ultimately assigned to CURLOPT_POSTFIELDS to correctly transmit the image data to the API.

By employing this solution, users can effectively post raw image data using a multipart/form-data header in PHP's curl extension.

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