Hey there. I found this in the Wordpress man. https://wordpress.org/support/topic/need-to-add-variable-to-function
It looks like the TRUE could break it, if the syntax is csse sensitive. I do apologize for not knowing the wordpress syntax. I guess put that down on things to learn. Great more marketable skills!
I hope this helps!
I have said it once, I will say it again. IT!