boolean

Data type:
boolean
Description:

Possible values for boolean variables are 1 and 0 meaning TRUE and FALSE.

Everything else is evaluated to one of these values by PHP: Non-empty strings (except 0 [zero]) are treated as TRUE, empty strings are evaluated to FALSE.

Examples:
dummy.enable = 0   # false, preferred notation
dummy.enable = 1   # true,  preferred notation
dummy.enable =     # false, because the value is empty