enter modem with cURL

I found some examples of login with cURL and I am using this ...

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'http://myhost/');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);

$output = curl_exec($ch);

if($output === FALSE){
echo 'cURLL Error:'.curl_error($ch);
}

curl_close($ch);

print_r($output);



?>

when you run it, it only prints a "1" and nothing else ...

What I'm trying is to enter a GSM modem that I have ... any advice?

thanks!