LVL UP PHP API

<?php
$id = 1;
$code = $_GET['kod'];
$nr = 70068;
$desc = "Test API";
$site=file_get_contents("https://lvlup.pro/api/checksms?id=".$id."&code=".$code."&number=".$nr."&desc=".$desc);
$json = json_decode($site);

if ($json->valid)
{
   echo "1".PHP_EOL;
}

else
{
   echo "0".PHP_EOL;
}