Module controller view string in page

[anddam]

Salam every one

 

my english is not well

 

i develop a module of payment that have a controller named validation.php 

this validation.php must view a string like this "ok-ok-ok-ok".

but this string must be viewed in page like a simple echo without html tags

 

i used the variable "content_only => true"  but it view in page source some tags that i dont need.