Create a Capacha display.
App::Html()->capachaTag(Name);
Name: Name of the capacha that used in Session to get the random value. See below example:
// Create capacha element
echo App::Html()->capachaTag("signup");
// Read from Session
$capchadata = App::Session()->read('capacha');
pr($capchadata);
/*
Return Value
Array
(
[signup] => 9574
)
*/