[Mythotical]

Anytime you use a var, it MUST be registered first.

PHP Code:

$templater->register('imp_var', $imp_var); 


You'll need to put 'do' into an array so it gets registered as well before you can use it. You register vars when you register the template, so if you want it in your main template then you have to register the var with your main template register.

Good read: https://vborg.vbsupport.ru/showthread.php?t=228078