how to upload file using cURL in php

I am sending normal data to curl,and along that data how to pass $FILES[‘file’][‘name’],$_FILES[‘file’][‘tmp_name’] as parameters to CURLOPT_POSTFIELDS,
by using ‘@’ curl response empty.

curl_setopt(
$request,
CURLOPT_POSTFIELDS,
array(
‘file’ =>
‘@’ . $_FILES[‘file’][‘tmp_name’]
. ‘;filename=’ . $_FILES[‘file’][‘name’]
));

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