// Prefill Gravity Form with User Data

function populate_usermeta($meta_key){ global $current_user;
return $current_user->__get($meta_key);
}
add_filter('gform_field_value_userfirstname', create_function("", '$value = populate_usermeta(\'user_firstname\'); return $value;' ));
add_filter('gform_field_value_userlastname', create_function("", '$value = populate_usermeta(\'user_lastname\'); return $value;' ));
add_filter('gform_field_value_useremail', create_function("", '$value = populate_usermeta(\'user_email\'); return $value;' ));
add_filter('gform_field_value_userwebsite', create_function("", '$value = populate_usermeta(\'user_url\'); return $value;' ));