Login to a web from CURL PHP

regards first of all I have a problem I am trying to start a session on this website link but I can not get the code to work and after starting I want to to go to the list of projects that is here link I would like to help me and thanks to this community every day we learn more with nothing more to say I leave the code

$username = 'Usuario';
$password = 'Pass';
$loginUrl = 'https://www.freelancer.es/login';

//init curl
$ch = curl_init();


curl_setopt($ch, CURLOPT_URL, $loginUrl);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, 'username='.$username.'&password='.$password);

curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

$store = curl_exec($ch);
curl_setopt($ch, CURLOPT_URL, "https://www.freelancer.es/search/projects");
$content = curl_exec($ch);
curl_close($ch);