Put

curl -X PUT -H "X-ACCESS-TOKEN: YOUR_ACCESS_TOKEN" -d "gender=male" -d "firstname=firstnameAPI" -d "lastname=User" -d "birth_date=1986-01-01" -d "address=Moosackerstr. 17" -d "zip_code=9444" -d "city=Diepoldsau" -d "country=CH" -d "description=I am the default API user." -d "website=https://www.yumpu.com" -d "blog=https://blog.yumpu.com" -d "language=de" "https://api.yumpu.com/2.0/user.json"

require_once('../yumpu.php');
$yumpu = new Yumpu();
$data = array(
    'gender' => 'male',
    'firstname' => 'firstnameAPI',
    'lastname' => 'User',
    'birth_date' => '1986-01-01',
    'address' => 'Moosackerstr. 17',
    'zip_code' => '9444',
    'city' => 'Diepoldsau',
    'country' => 'CH',
    'description' => 'I am the default API user.',
    'website' => 'https://www.yumpu.com',
    'blog' => 'https://blog.yumpu.com',
    'language' => 'de'
);
$putUser = $yumpu->putUser($data);
print_r($putUser);