curl_setopt($ch,CURLOPT_POSTFIELDS,http_build_query(array("data"=>$fields_string)));
Now on the server end $_POST['data'] will contain your json data.
if you just pass the $fields_string it can be read in the server end too.
$data = file_get_contents("php://input");
now $data will contain your json data.
It completely depends on the server you are interacting with. If it
needs json in a variable then pass it using http_build_query.
Otherwise just pass json as you are doing right now.
What you server expects?
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Shiplu Mokaddim
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