CURLOPT_SAFE_UPLOAD

CURLOPT_SAFE_UPLOAD is one of the accepted parameters for curl_setopt parameter #2.

CURLOPT_SAFE_UPLOAD — Always true, what disables support for the @ prefix for uploading files in CURLOPT_POSTFIELDS, which means that values starting with @ can be safely passed as fields. CURLFile may be used for uploads instead.

CURLOPT_SAFE_UPLOAD = -1;