Question

Been seeing some curly braces in a CodeIgniter model/views:

mkdir("userdata/{$userID}/live/",0755,true);

I know $userID is some type of variable which probably contains session user id of user. My question is how can set some values for me to use such { }.

Answer 1

{$varname} is an explicit way of specifying the border of the variable name

"$abcdefg"

in this case php will try to output the value of variable with name abcdefg

"{$a}bcdefg"

in this case it will output the value of the variable a and append it with string literal bcdefg.

So you can use any variable you have visible in current scope within curly braces