Can file_get_contents() Perform File Uploads with multipart/form-data?

Uploading Files with file_get_contents() and multipart/form-data

Despite the ease of file uploads with CURL, users may be curious whether file_get_contents() can perform this task using the http stream context.

Multipart Content-Type presents a challenge in file uploading. It requires defining a boundary to delimit each part within the uploaded file. This boundary, as any string not contained in the content body, can be generated using a timestamp with microtime(true).

Once the boundary is defined, it must be specified in the Content-Type header. Additionally, a content body following the HTTP specification and the sent header needs to be constructed. Each form field name must be included in the Content-Disposition header, along with filename and Content-Type headers.

If multiple files are to be uploaded, the process of generating the $content string must be repeated for each file, specifying different FORM_FIELD values accordingly.

Finally, the stream context can be built using the context parameter of file_get_contents(). The http array within the context parameter configures the method (POST), headers (including the Content-Type with the multipart boundary), and content.

By executing file_get_contents() with the configured context, the file upload is initiated. Notably, binary file encoding is unnecessary as HTTP can effectively handle binary data.

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