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Data type:



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.

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