How to Upload Files Using file_get_contents with Multipart Content-Type?

Utilizing file_get_contents to Upload Files

While CURL may be a convenient tool for file uploads, file_get_contents offers an alternative solution with the use of an HTTP stream context. This article explores the process of uploading a file to a remote web server with file_get_contents.

Defining Multipart Content-Type

In multipart Content-Type requests, a distinct boundary string separates each part of the request. This boundary should not appear in the content body and is typically set as a timestamp.

Once the boundary is established, include it in the Content-Type header to inform the webserver of the expected delimiter.

Building the Content Body

Create a form field name and compose the content body as per the HTTP multipart specification. For each file being uploaded, specify its name and original filename in the Content-Disposition header. Include the MIME type for proper file recognition.

Creating the Context

Construct the stream context by defining the method, header, and content for the HTTP request.

Initiating the Upload

Execute the file_get_contents function with the context to upload the file.

Considerations

Note that binary files can be transmitted without encoding as HTTP inherently supports binary data.

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