Fix my PHP cURL command

Fix this PHP snippet so it works:

define('USER_AGENT', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.72 Safari/537.36');


$loginUrl = 'https://www.corrlinks.com/Login.aspx';
$ch = curl_init($loginUrl);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
'User-Agent: ' . USER_AGENT,
]);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$resp = curl_exec($ch);
curl_close($ch);