Trouble posting with cURL

Question

I'm trying to make cURL post to this page the data txt_code=1605120090100999. Can anyone show me the PHP code that posts that value to that page and gives me the result as output?

I tried this:

$url = 'http://195.246.54.62/support/mis_support.aspx';
$txt_code = '1605120090100999';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch,CURLOPT_COOKIEFILE,1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "txt_code=$txt_code");

// Execute...
$output = curl_exec($ch);
echo $output;

but it gave me the page without post

Answer 1

curl_exec — Perform a cURL session Returns TRUE on success or FALSE on failure. However, if the CURLOPT_RETURNTRANSFER option is set, it will return the result on success, FALSE on failure.

curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

EDITed for the actual answer